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[PATCH v22 2/8] Row pattern recognition patch (parse/analysis).
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* [PATCH v22 2/8] Row pattern recognition patch (parse/analysis).
@ 2024-09-19 04:48 Tatsuo Ishii <ishii@postgresql.org>
  0 siblings, 0 replies; 456+ messages in thread

From: Tatsuo Ishii @ 2024-09-19 04:48 UTC (permalink / raw)

---
 src/backend/parser/parse_agg.c    |   7 +
 src/backend/parser/parse_clause.c | 296 +++++++++++++++++++++++++++++-
 src/backend/parser/parse_expr.c   |   6 +
 src/backend/parser/parse_func.c   |   3 +
 4 files changed, 311 insertions(+), 1 deletion(-)

diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c
index efa730c167..a80263f90d 100644
--- a/src/backend/parser/parse_agg.c
+++ b/src/backend/parser/parse_agg.c
@@ -580,6 +580,10 @@ check_agglevels_and_constraints(ParseState *pstate, Node *expr)
 			errkind = true;
 			break;
 
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
+
 			/*
 			 * There is intentionally no default: case here, so that the
 			 * compiler will warn if we add a new ParseExprKind without
@@ -970,6 +974,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
 		case EXPR_KIND_CYCLE_MARK:
 			errkind = true;
 			break;
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
 
 			/*
 			 * There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_clause.c b/src/backend/parser/parse_clause.c
index 8118036495..9762dce81f 100644
--- a/src/backend/parser/parse_clause.c
+++ b/src/backend/parser/parse_clause.c
@@ -98,7 +98,14 @@ static WindowClause *findWindowClause(List *wclist, const char *name);
 static Node *transformFrameOffset(ParseState *pstate, int frameOptions,
 								  Oid rangeopfamily, Oid rangeopcintype, Oid *inRangeFunc,
 								  Node *clause);
-
+static void transformRPR(ParseState *pstate, WindowClause *wc, WindowDef *windef,
+						 List **targetlist);
+static List *transformDefineClause(ParseState *pstate, WindowClause *wc, WindowDef *windef,
+								   List **targetlist);
+static void transformPatternClause(ParseState *pstate, WindowClause *wc,
+								   WindowDef *windef);
+static List *transformMeasureClause(ParseState *pstate, WindowClause *wc,
+									WindowDef *windef);
 
 /*
  * transformFromClause -
@@ -2956,6 +2963,10 @@ transformWindowDefinitions(ParseState *pstate,
 											 rangeopfamily, rangeopcintype,
 											 &wc->endInRangeFunc,
 											 windef->endOffset);
+
+		/* Process Row Pattern Recognition related clauses */
+		transformRPR(pstate, wc, windef, targetlist);
+
 		wc->winref = winref;
 
 		result = lappend(result, wc);
@@ -3820,3 +3831,286 @@ transformFrameOffset(ParseState *pstate, int frameOptions,
 
 	return node;
 }
+
+/*
+ * transformRPR
+ *		Process Row Pattern Recognition related clauses
+ */
+static void
+transformRPR(ParseState *pstate, WindowClause *wc, WindowDef *windef,
+			 List **targetlist)
+{
+	/*
+	 * Window definition exists?
+	 */
+	if (windef == NULL)
+		return;
+
+	/*
+	 * Row Pattern Common Syntax clause exists?
+	 */
+	if (windef->rpCommonSyntax == NULL)
+		return;
+
+	/* Check Frame option. Frame must start at current row */
+	if ((wc->frameOptions & FRAMEOPTION_START_CURRENT_ROW) == 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_SYNTAX_ERROR),
+				 errmsg("FRAME must start at current row when row patttern recognition is used")));
+
+	/* Transform AFTER MACH SKIP TO clause */
+	wc->rpSkipTo = windef->rpCommonSyntax->rpSkipTo;
+
+	/* Transform AFTER MACH SKIP TO variable */
+	wc->rpSkipVariable = windef->rpCommonSyntax->rpSkipVariable;
+
+	/* Transform SEEK or INITIAL clause */
+	wc->initial = windef->rpCommonSyntax->initial;
+
+	/* Transform DEFINE clause into list of TargetEntry's */
+	wc->defineClause = transformDefineClause(pstate, wc, windef, targetlist);
+
+	/* Check PATTERN clause and copy to patternClause */
+	transformPatternClause(pstate, wc, windef);
+
+	/* Transform MEASURE clause */
+	transformMeasureClause(pstate, wc, windef);
+}
+
+/*
+ * transformDefineClause Process DEFINE clause and transform ResTarget into
+ *		list of TargetEntry.
+ *
+ * XXX we only support column reference in row pattern definition search
+ * condition, e.g. "price". <row pattern definition variable name>.<column
+ * reference> is not supported, e.g. "A.price".
+ */
+static List *
+transformDefineClause(ParseState *pstate, WindowClause *wc, WindowDef *windef,
+					  List **targetlist)
+{
+	/* DEFINE variable name initials */
+	static char *defineVariableInitials = "abcdefghijklmnopqrstuvwxyz";
+
+	ListCell   *lc,
+			   *l;
+	ResTarget  *restarget,
+			   *r;
+	List	   *restargets;
+	List	   *defineClause;
+	char	   *name;
+	int			initialLen;
+	int			i;
+
+	/*
+	 * If Row Definition Common Syntax exists, DEFINE clause must exist. (the
+	 * raw parser should have already checked it.)
+	 */
+	Assert(windef->rpCommonSyntax->rpDefs != NULL);
+
+	/*
+	 * Check and add "A AS A IS TRUE" if pattern variable is missing in DEFINE
+	 * per the SQL standard.
+	 */
+	restargets = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpPatterns)
+	{
+		A_Expr	   *a;
+		bool		found = false;
+
+		if (!IsA(lfirst(lc), A_Expr))
+			ereport(ERROR,
+					errmsg("node type is not A_Expr"));
+
+		a = (A_Expr *) lfirst(lc);
+		name = strVal(a->lexpr);
+
+		foreach(l, windef->rpCommonSyntax->rpDefs)
+		{
+			restarget = (ResTarget *) lfirst(l);
+
+			if (!strcmp(restarget->name, name))
+			{
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+		{
+			/*
+			 * "name" is missing. So create "name AS name IS TRUE" ResTarget
+			 * node and add it to the temporary list.
+			 */
+			A_Const    *n;
+
+			restarget = makeNode(ResTarget);
+			n = makeNode(A_Const);
+			n->val.boolval.type = T_Boolean;
+			n->val.boolval.boolval = true;
+			n->location = -1;
+			restarget->name = pstrdup(name);
+			restarget->indirection = NIL;
+			restarget->val = (Node *) n;
+			restarget->location = -1;
+			restargets = lappend((List *) restargets, restarget);
+		}
+	}
+
+	if (list_length(restargets) >= 1)
+	{
+		/* add missing DEFINEs */
+		windef->rpCommonSyntax->rpDefs =
+			list_concat(windef->rpCommonSyntax->rpDefs, restargets);
+		list_free(restargets);
+	}
+
+	/*
+	 * Check for duplicate row pattern definition variables.  The standard
+	 * requires that no two row pattern definition variable names shall be
+	 * equivalent.
+	 */
+	restargets = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpDefs)
+	{
+		restarget = (ResTarget *) lfirst(lc);
+		name = restarget->name;
+
+		/*
+		 * Add DEFINE expression (Restarget->val) to the targetlist as a
+		 * TargetEntry if it does not exist yet. Planner will add the column
+		 * ref var node to the outer plan's target list later on. This makes
+		 * DEFINE expression could access the outer tuple while evaluating
+		 * PATTERN.
+		 *
+		 * XXX: adding whole expressions of DEFINE to the plan.targetlist is
+		 * not so good, because it's not necessary to evalute the expression
+		 * in the target list while running the plan. We should extract the
+		 * var nodes only then add them to the plan.targetlist.
+		 */
+		findTargetlistEntrySQL99(pstate, (Node *) restarget->val,
+								 targetlist, EXPR_KIND_RPR_DEFINE);
+
+		/*
+		 * Make sure that the row pattern definition search condition is a
+		 * boolean expression.
+		 */
+		transformWhereClause(pstate, restarget->val,
+							 EXPR_KIND_RPR_DEFINE, "DEFINE");
+
+		foreach(l, restargets)
+		{
+			char	   *n;
+
+			r = (ResTarget *) lfirst(l);
+			n = r->name;
+
+			if (!strcmp(n, name))
+				ereport(ERROR,
+						(errcode(ERRCODE_SYNTAX_ERROR),
+						 errmsg("row pattern definition variable name \"%s\" appears more than once in DEFINE clause",
+								name),
+						 parser_errposition(pstate, exprLocation((Node *) r))));
+		}
+		restargets = lappend(restargets, restarget);
+	}
+	list_free(restargets);
+
+	/*
+	 * Create list of row pattern DEFINE variable name's initial. We assign
+	 * [a-z] to them (up to 26 variable names are allowed).
+	 */
+	restargets = NIL;
+	i = 0;
+	initialLen = strlen(defineVariableInitials);
+
+	foreach(lc, windef->rpCommonSyntax->rpDefs)
+	{
+		char		initial[2];
+
+		restarget = (ResTarget *) lfirst(lc);
+		name = restarget->name;
+
+		if (i >= initialLen)
+		{
+			ereport(ERROR,
+					(errcode(ERRCODE_SYNTAX_ERROR),
+					 errmsg("number of row pattern definition variable names exceeds %d",
+							initialLen),
+					 parser_errposition(pstate,
+										exprLocation((Node *) restarget))));
+		}
+		initial[0] = defineVariableInitials[i++];
+		initial[1] = '\0';
+		wc->defineInitial = lappend(wc->defineInitial,
+									makeString(pstrdup(initial)));
+	}
+
+	defineClause = transformTargetList(pstate, windef->rpCommonSyntax->rpDefs,
+									   EXPR_KIND_RPR_DEFINE);
+
+	/* mark column origins */
+	markTargetListOrigins(pstate, defineClause);
+
+	/* mark all nodes in the DEFINE clause tree with collation information */
+	assign_expr_collations(pstate, (Node *) defineClause);
+
+	return defineClause;
+}
+
+/*
+ * transformPatternClause
+ *		Process PATTERN clause and return PATTERN clause in the raw parse tree
+ */
+static void
+transformPatternClause(ParseState *pstate, WindowClause *wc,
+					   WindowDef *windef)
+{
+	ListCell   *lc;
+
+	/*
+	 * Row Pattern Common Syntax clause exists?
+	 */
+	if (windef->rpCommonSyntax == NULL)
+		return;
+
+	wc->patternVariable = NIL;
+	wc->patternRegexp = NIL;
+	foreach(lc, windef->rpCommonSyntax->rpPatterns)
+	{
+		A_Expr	   *a;
+		char	   *name;
+		char	   *regexp;
+
+		if (!IsA(lfirst(lc), A_Expr))
+			ereport(ERROR,
+					errmsg("node type is not A_Expr"));
+
+		a = (A_Expr *) lfirst(lc);
+		name = strVal(a->lexpr);
+
+		wc->patternVariable = lappend(wc->patternVariable, makeString(pstrdup(name)));
+		regexp = strVal(lfirst(list_head(a->name)));
+
+		wc->patternRegexp = lappend(wc->patternRegexp, makeString(pstrdup(regexp)));
+	}
+}
+
+/*
+ * transformMeasureClause
+ *		Process MEASURE clause
+ *	XXX MEASURE clause is not supported yet
+ */
+static List *
+transformMeasureClause(ParseState *pstate, WindowClause *wc,
+					   WindowDef *windef)
+{
+	if (windef->rowPatternMeasures == NIL)
+		return NIL;
+
+	ereport(ERROR,
+			(errcode(ERRCODE_SYNTAX_ERROR),
+			 errmsg("%s", "MEASURE clause is not supported yet"),
+			 parser_errposition(pstate, exprLocation((Node *) windef->rowPatternMeasures))));
+	return NIL;
+}
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 36c1b7a88f..fe154bcaa0 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -577,6 +577,7 @@ transformColumnRef(ParseState *pstate, ColumnRef *cref)
 		case EXPR_KIND_COPY_WHERE:
 		case EXPR_KIND_GENERATED_COLUMN:
 		case EXPR_KIND_CYCLE_MARK:
+		case EXPR_KIND_RPR_DEFINE:
 			/* okay */
 			break;
 
@@ -1860,6 +1861,9 @@ transformSubLink(ParseState *pstate, SubLink *sublink)
 		case EXPR_KIND_GENERATED_COLUMN:
 			err = _("cannot use subquery in column generation expression");
 			break;
+		case EXPR_KIND_RPR_DEFINE:
+			err = _("cannot use subquery in DEFINE expression");
+			break;
 
 			/*
 			 * There is intentionally no default: case here, so that the
@@ -3199,6 +3203,8 @@ ParseExprKindName(ParseExprKind exprKind)
 			return "GENERATED AS";
 		case EXPR_KIND_CYCLE_MARK:
 			return "CYCLE";
+		case EXPR_KIND_RPR_DEFINE:
+			return "DEFINE";
 
 			/*
 			 * There is intentionally no default: case here, so that the
diff --git a/src/backend/parser/parse_func.c b/src/backend/parser/parse_func.c
index 9b23344a3b..4c482abb30 100644
--- a/src/backend/parser/parse_func.c
+++ b/src/backend/parser/parse_func.c
@@ -2658,6 +2658,9 @@ check_srf_call_placement(ParseState *pstate, Node *last_srf, int location)
 		case EXPR_KIND_CYCLE_MARK:
 			errkind = true;
 			break;
+		case EXPR_KIND_RPR_DEFINE:
+			errkind = true;
+			break;
 
 			/*
 			 * There is intentionally no default: case here, so that the
-- 
2.25.1


----Next_Part(Thu_Sep_19_13_59_47_2024_608)--
Content-Type: Text/X-Patch; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="v22-0003-Row-pattern-recognition-patch-rewriter.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


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Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



^ permalink  raw  reply  [nested|flat] 456+ messages in thread

* [PATCH v44 05/10] Rename ChangeDest to ChangeContext, and absorb IndexInsertState
@ 2026-03-23 20:27 Álvaro Herrera <alvherre@kurilemu.de>
  0 siblings, 0 replies; 456+ messages in thread

From: Álvaro Herrera @ 2026-03-23 20:27 UTC (permalink / raw)

This makes the data structure simpler, as we only need a single struct
which can be passed down to all functions.

Also, the inititalization and release sequences are a bit simpler
and there's a single location in charge.
---
 src/backend/commands/cluster.c   | 307 ++++++++++++++-----------------
 src/tools/pgindent/typedefs.list |   2 +-
 2 files changed, 135 insertions(+), 174 deletions(-)

diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b4acaeb6b93..b86e600af41 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -113,15 +113,6 @@ typedef struct
 static RelFileLocator repacked_rel_locator = {.relNumber = InvalidOid};
 static RelFileLocator repacked_rel_toast_locator = {.relNumber = InvalidOid};
 
-/*
- * Everything we need to call ExecInsertIndexTuples().
- */
-typedef struct IndexInsertState
-{
-	ResultRelInfo *rri;
-	EState	   *estate;
-} IndexInsertState;
-
 /* The WAL segment being decoded. */
 static XLogSegNo repack_current_segment = 0;
 
@@ -134,31 +125,27 @@ static XLogSegNo repack_current_segment = 0;
 /*
  * Information needed to apply concurrent data changes.
  */
-typedef struct ChangeDest
+typedef struct ChangeContext
 {
 	/* The relation the changes are applied to. */
-	Relation	rel;
-
-	/*
-	 * The following is needed to find the existing tuple if the change is
-	 * UPDATE or DELETE. 'ident_key' should have all the fields except for
-	 * 'sk_argument' initialized.
-	 */
-	Relation	ident_index;
-	ScanKey		ident_key;
-	int			ident_key_nentries;
+	Relation	cc_rel;
 
 	/* Needed to update indexes of rel_dst. */
-	IndexInsertState *iistate;
+	ResultRelInfo *cc_rri;
+	EState	   *cc_estate;
 
 	/*
-	 * Sequential number of the file containing the changes.
-	 *
-	 * TODO This field makes the structure name less descriptive. Should we
-	 * rename it, e.g. to ChangeApplyInfo?
+	 * Existing tuples to UPDATE and DELETE are located via this index. We
+	 * keep the scankey in partially initialized state to avoid repeated work.
+	 * sk_argument is completed on the fly.
 	 */
-	int			file_seq;
-} ChangeDest;
+	Relation	cc_ident_index;
+	ScanKey		cc_ident_key;
+	int			cc_ident_key_nentries;
+
+	/* Sequential number of the file containing the changes. */
+	int			cc_file_seq;
+} ChangeContext;
 
 /*
  * Layout of shared memory used for communication between backend and the
@@ -278,29 +265,27 @@ static bool repack_is_permitted_for_relation(RepackCommand cmd,
 static LogicalDecodingContext *repack_setup_logical_decoding(Oid relid);
 static bool decode_concurrent_changes(LogicalDecodingContext *ctx,
 									  DecodingWorkerShared *shared);
-static void apply_concurrent_changes(BufFile *file, ChangeDest *dest);
+static void apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt);
 static void apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 									TupleTableSlot *ondisk_tuple,
-									IndexInsertState *iistate);
+									ChangeContext *chgcxt);
 static void apply_concurrent_delete(Relation rel, TupleTableSlot *slot);
 static void restore_tuple(BufFile *file, Relation relation,
 						  TupleTableSlot *slot);
 static void adjust_toast_pointers(Relation relation, TupleTableSlot *dest,
-									   TupleTableSlot *src);
-static bool find_target_tuple(Relation rel, ChangeDest *dest,
+								  TupleTableSlot *src);
+static bool find_target_tuple(Relation rel, ChangeContext *chgcxt,
 							  TupleTableSlot *locator,
 							  TupleTableSlot *received);
 static void process_concurrent_changes(XLogRecPtr end_of_wal,
-									   ChangeDest *dest,
+									   ChangeContext *chgcxt,
 									   bool done);
-static IndexInsertState *get_index_insert_state(Relation relation,
-												Oid ident_index_id,
-												Relation *ident_index_p);
-static ScanKey build_identity_key(Oid ident_idx_oid, Relation rel_src,
-								  int *nentries);
-static void free_index_insert_state(IndexInsertState *iistate);
+static void initialize_change_context(ChangeContext *chgcxt,
+									  Relation relation,
+									  Oid ident_index_id);
+static void release_change_context(ChangeContext *chgcxt);
 static void cleanup_logical_decoding(LogicalDecodingContext *ctx);
 static void rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 											   Oid identIdx,
@@ -2871,13 +2856,13 @@ decode_concurrent_changes(LogicalDecodingContext *ctx,
  * Apply changes stored in 'file'.
  */
 static void
-apply_concurrent_changes(BufFile *file, ChangeDest *dest)
+apply_concurrent_changes(BufFile *file, ChangeContext *chgcxt)
 {
-	ConcurrentChangeKind	kind = '\0';
-	Relation	rel = dest->rel;
-	TupleTableSlot	*spilled_tuple;
-	TupleTableSlot	*old_update_tuple;
-	TupleTableSlot  *ondisk_tuple;
+	ConcurrentChangeKind kind = '\0';
+	Relation	rel = chgcxt->cc_rel;
+	TupleTableSlot *spilled_tuple;
+	TupleTableSlot *old_update_tuple;
+	TupleTableSlot *ondisk_tuple;
 	MemoryContext apply_cxt;
 	bool		have_old_tuple = false;
 
@@ -2924,12 +2909,12 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		/*
 		 * Just before an UPDATE or DELETE, we must update the command
-		 * counter, because the change could refer to a tuple that we
-		 * have just inserted; and before an INSERT, we have to do this
-		 * also if the previous command was either update or delete.
+		 * counter, because the change could refer to a tuple that we have
+		 * just inserted; and before an INSERT, we have to do this also if the
+		 * previous command was either update or delete.
 		 *
-		 * With this approach we don't spend so many CCIs for long
-		 * strings of only INSERTs, which can't affect one another.
+		 * With this approach we don't spend so many CCIs for long strings of
+		 * only INSERTs, which can't affect one another.
 		 */
 		if (kind == CHANGE_UPDATE_NEW || kind == CHANGE_DELETE ||
 			(kind == CHANGE_INSERT && (prevkind == CHANGE_UPDATE_NEW ||
@@ -2946,22 +2931,22 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 
 		if (kind == CHANGE_INSERT)
 		{
-			apply_concurrent_insert(rel, spilled_tuple, dest->iistate);
+			apply_concurrent_insert(rel, spilled_tuple, chgcxt);
 		}
 		else if (kind == CHANGE_DELETE)
 		{
-			bool	found;
+			bool		found;
 
 			/* Find the tuple to be deleted */
-			found = find_target_tuple(rel, dest, spilled_tuple, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, spilled_tuple, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 			apply_concurrent_delete(rel, ondisk_tuple);
 		}
 		else if (kind == CHANGE_UPDATE_NEW)
 		{
-			TupleTableSlot	*key;
-			bool	found;
+			TupleTableSlot *key;
+			bool		found;
 
 			if (have_old_tuple)
 				key = old_update_tuple;
@@ -2969,20 +2954,20 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
 				key = spilled_tuple;
 
 			/* Find the tuple to be updated or deleted. */
-			found = find_target_tuple(rel, dest, key, ondisk_tuple);
+			found = find_target_tuple(rel, chgcxt, key, ondisk_tuple);
 			if (!found)
 				elog(ERROR, "failed to find target tuple");
 
 			/*
 			 * If 'tup' contains TOAST pointers, they point to the old
-			 * relation's toast. Copy the corresponding TOAST pointers for
-			 * the new relation from the existing tuple. (The fact that we
-			 * received a TOAST pointer here implies that the attribute
-			 * hasn't changed.)
+			 * relation's toast. Copy the corresponding TOAST pointers for the
+			 * new relation from the existing tuple. (The fact that we
+			 * received a TOAST pointer here implies that the attribute hasn't
+			 * changed.)
 			 */
 			adjust_toast_pointers(rel, spilled_tuple, ondisk_tuple);
 
-			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, dest->iistate);
+			apply_concurrent_update(rel, spilled_tuple, ondisk_tuple, chgcxt);
 
 			ExecClearTuple(old_update_tuple);
 			have_old_tuple = false;
@@ -3006,7 +2991,7 @@ apply_concurrent_changes(BufFile *file, ChangeDest *dest)
  */
 static void
 apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	List	   *recheck;
 
@@ -3019,8 +3004,8 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 	 * action that already happened, we have no use for the recheck list of
 	 * indexes returned, so just free it.  XXX or maybe just leave it?
 	 */
-	recheck = ExecInsertIndexTuples(iistate->rri,
-									iistate->estate,
+	recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+									chgcxt->cc_estate,
 									0,
 									slot,
 									NIL, NULL);
@@ -3028,7 +3013,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_INSERTED, 1);
 
-	ResetPerTupleExprContext(iistate->estate);
+	ResetPerTupleExprContext(chgcxt->cc_estate);
 }
 
 /*
@@ -3038,7 +3023,7 @@ apply_concurrent_insert(Relation rel, TupleTableSlot *slot,
 static void
 apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 						TupleTableSlot *ondisk_tuple,
-						IndexInsertState *iistate)
+						ChangeContext *chgcxt)
 {
 	LockTupleMode lockmode;
 	TM_FailureData tmfd;
@@ -3065,13 +3050,13 @@ apply_concurrent_update(Relation rel, TupleTableSlot *spilled_tuple,
 
 		if (update_indexes == TU_Summarizing)
 			flags |= EIIT_ONLY_SUMMARIZING;
-		recheck = ExecInsertIndexTuples(iistate->rri,
-										iistate->estate,
+		recheck = ExecInsertIndexTuples(chgcxt->cc_rri,
+										chgcxt->cc_estate,
 										flags,
 										spilled_tuple,
 										NIL, NULL);
 		list_free(recheck);
-		ResetPerTupleExprContext(iistate->estate);
+		ResetPerTupleExprContext(chgcxt->cc_estate);
 	}
 
 	pgstat_progress_incr_param(PROGRESS_REPACK_HEAP_TUPLES_UPDATED, 1);
@@ -3135,19 +3120,19 @@ restore_tuple(BufFile *file, Relation relation, TupleTableSlot *slot)
 	ExecForceStoreHeapTuple(tup, slot, false);
 
 	/*
-	 * Next, read any attributes we stored separately into the tts_values array
-	 * elements expecting them, if any.  This matches store_change.
+	 * Next, read any attributes we stored separately into the tts_values
+	 * array elements expecting them, if any.  This matches store_change.
 	 */
 	BufFileReadExact(file, &natt_ext, sizeof(natt_ext));
 	if (natt_ext > 0)
 	{
-		TupleDesc desc = slot->tts_tupleDescriptor;
+		TupleDesc	desc = slot->tts_tupleDescriptor;
 
 		for (int i = 0; i < desc->natts; i++)
 		{
 			CompactAttribute *attr = TupleDescCompactAttr(desc, i);
-			varlena	   *varlen;
-			alignas(uint32) varlena	varhdr;
+			varlena    *varlen;
+			alignas(uint32) varlena varhdr;
 			void	   *value;
 			Size		varlensz;
 
@@ -3219,10 +3204,10 @@ adjust_toast_pointers(Relation relation, TupleTableSlot *dest, TupleTableSlot *s
  * not found, return false.
  */
 static bool
-find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
+find_target_tuple(Relation rel, ChangeContext *chgcxt, TupleTableSlot *locator,
 				  TupleTableSlot *retrieved)
 {
-	Form_pg_index idx = dest->ident_index->rd_index;
+	Form_pg_index idx = chgcxt->cc_ident_index->rd_index;
 	IndexScanDesc scan;
 	bool		retval;
 
@@ -3233,9 +3218,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	 *
 	 * Use the incoming tuple to finalize the scan key.
 	 */
-	for (int i = 0; i < dest->ident_key_nentries; i++)
+	for (int i = 0; i < chgcxt->cc_ident_key_nentries; i++)
 	{
-		ScanKey		entry = &dest->ident_key[i];
+		ScanKey		entry = &chgcxt->cc_ident_key[i];
 		AttrNumber	attno = idx->indkey.values[i];
 
 		entry->sk_argument = locator->tts_values[attno - 1];
@@ -3243,9 +3228,9 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
 	}
 
 	/* XXX no instrumentation for now */
-	scan = index_beginscan(rel, dest->ident_index, GetActiveSnapshot(),
-						   NULL, dest->ident_key_nentries, 0);
-	index_rescan(scan, dest->ident_key, dest->ident_key_nentries, NULL, 0);
+	scan = index_beginscan(rel, chgcxt->cc_ident_index, GetActiveSnapshot(),
+						   NULL, chgcxt->cc_ident_key_nentries, 0);
+	index_rescan(scan, chgcxt->cc_ident_key, chgcxt->cc_ident_key_nentries, NULL, 0);
 	retval = index_getnext_slot(scan, ForwardScanDirection, retrieved);
 	index_endscan(scan);
 
@@ -3260,7 +3245,7 @@ find_target_tuple(Relation rel, ChangeDest *dest, TupleTableSlot *locator,
  * are far too similar to each other.
  */
 static void
-process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
+process_concurrent_changes(XLogRecPtr end_of_wal, ChangeContext *chgcxt, bool done)
 {
 	DecodingWorkerShared *shared;
 	char		fname[MAXPGPATH];
@@ -3293,7 +3278,7 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 		/*
 		 * Has the worker exported the file we are waiting for?
 		 */
-		if (last_exported == dest->file_seq)
+		if (last_exported == chgcxt->cc_file_seq)
 			break;
 
 		ConditionVariableSleep(&shared->cv, WAIT_EVENT_REPACK_WORKER_EXPORT);
@@ -3301,117 +3286,99 @@ process_concurrent_changes(XLogRecPtr end_of_wal, ChangeDest *dest, bool done)
 	ConditionVariableCancelSleep();
 
 	/* Open the file. */
-	DecodingWorkerFileName(fname, shared->relid, dest->file_seq);
+	DecodingWorkerFileName(fname, shared->relid, chgcxt->cc_file_seq);
 	file = BufFileOpenFileSet(&shared->sfs.fs, fname, O_RDONLY, false);
-	apply_concurrent_changes(file, dest);
+	apply_concurrent_changes(file, chgcxt);
 
 	BufFileClose(file);
 
 	/* Get ready for the next file. */
-	dest->file_seq++;
+	chgcxt->cc_file_seq++;
 }
 
 /*
- * Initialize IndexInsertState for index specified by ident_index_id.
- *
- * While doing that, also return the identity index in *ident_index_p.
+ * Initialize the ChangeContext struct for the given relation, with
+ * the given index as identity index.
  */
-static IndexInsertState *
-get_index_insert_state(Relation relation, Oid ident_index_id,
-					   Relation *ident_index_p)
+static void
+initialize_change_context(ChangeContext *chgcxt,
+						  Relation relation, Oid ident_index_id)
 {
-	EState	   *estate;
-	IndexInsertState *result;
-	Relation	ident_index = NULL;
+	chgcxt->cc_rel = relation;
 
-	result = (IndexInsertState *) palloc0(sizeof(IndexInsertState));
-	estate = CreateExecutorState();
+	/* Only initialize fields needed by ExecInsertIndexTuples(). */
+	chgcxt->cc_estate = CreateExecutorState();
 
-	result->rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
-	InitResultRelInfo(result->rri, relation, 0, 0, 0);
-	ExecOpenIndices(result->rri, false);
+	chgcxt->cc_rri = (ResultRelInfo *) palloc(sizeof(ResultRelInfo));
+	InitResultRelInfo(chgcxt->cc_rri, relation, 0, 0, 0);
+	ExecOpenIndices(chgcxt->cc_rri, false);
 
 	/*
-	 * Find the relcache entry of the identity index so that we spend no extra
-	 * effort to open / close it.
+	 * The table's relcache entry already has the relcache entry for the
+	 * identity index; find that.
 	 */
-	for (int i = 0; i < result->rri->ri_NumIndices; i++)
+	chgcxt->cc_ident_index = NULL;
+	for (int i = 0; i < chgcxt->cc_rri->ri_NumIndices; i++)
 	{
 		Relation	ind_rel;
 
-		ind_rel = result->rri->ri_IndexRelationDescs[i];
+		ind_rel = chgcxt->cc_rri->ri_IndexRelationDescs[i];
 		if (ind_rel->rd_id == ident_index_id)
-			ident_index = ind_rel;
+		{
+			chgcxt->cc_ident_index = ind_rel;
+			break;
+		}
 	}
-	if (ident_index == NULL)
+	if (chgcxt->cc_ident_index == NULL)
 		elog(ERROR, "failed to find identity index");
 
-	/* Only initialize fields needed by ExecInsertIndexTuples(). */
-	result->estate = estate;
-
-	*ident_index_p = ident_index;
-	return result;
-}
-
-/*
- * Build scan key to process logical changes.
- */
-static ScanKey
-build_identity_key(Oid ident_idx_oid, Relation rel_src, int *nentries)
-{
-	Relation	ident_idx_rel;
-	Form_pg_index ident_idx;
-	int			n,
-				i;
-	ScanKey		result;
-
-	Assert(OidIsValid(ident_idx_oid));
-	ident_idx_rel = index_open(ident_idx_oid, AccessShareLock);
-	ident_idx = ident_idx_rel->rd_index;
-	n = ident_idx->indnkeyatts;
-	result = (ScanKey) palloc(sizeof(ScanKeyData) * n);
-	for (i = 0; i < n; i++)
+	/* Set up for scanning said identity index */
 	{
-		ScanKey		entry;
-		Oid			opfamily,
-					opcintype,
-					opno,
-					opcode;
+		Form_pg_index indexForm;
 
-		entry = &result[i];
+		indexForm = chgcxt->cc_ident_index->rd_index;
+		chgcxt->cc_ident_key_nentries = indexForm->indnkeyatts;
+		chgcxt->cc_ident_key = (ScanKey) palloc_array(ScanKeyData, indexForm->indnkeyatts);
+		for (int i = 0; i < indexForm->indnkeyatts; i++)
+		{
+			ScanKey		entry;
+			Oid			opfamily,
+						opcintype,
+						opno,
+						opcode;
 
-		opfamily = ident_idx_rel->rd_opfamily[i];
-		opcintype = ident_idx_rel->rd_opcintype[i];
-		opno = get_opfamily_member(opfamily, opcintype, opcintype,
-								   BTEqualStrategyNumber);
+			entry = &chgcxt->cc_ident_key[i];
 
-		if (!OidIsValid(opno))
-			elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opfamily = chgcxt->cc_ident_index->rd_opfamily[i];
+			opcintype = chgcxt->cc_ident_index->rd_opcintype[i];
+			opno = get_opfamily_member(opfamily, opcintype, opcintype,
+									   BTEqualStrategyNumber);
+			if (!OidIsValid(opno))
+				elog(ERROR, "failed to find = operator for type %u", opcintype);
+			opcode = get_opcode(opno);
+			if (!OidIsValid(opcode))
+				elog(ERROR, "failed to find = operator for operator %u", opno);
 
-		opcode = get_opcode(opno);
-		if (!OidIsValid(opcode))
-			elog(ERROR, "failed to find = operator for operator %u", opno);
-
-		/* Initialize everything but argument. */
-		ScanKeyInit(entry,
-					i + 1,
-					BTEqualStrategyNumber, opcode,
-					(Datum) NULL);
-		entry->sk_collation = ident_idx_rel->rd_indcollation[i];
+			/* Initialize everything but argument. */
+			ScanKeyInit(entry,
+						i + 1,
+						BTEqualStrategyNumber, opcode,
+						(Datum) NULL);
+			entry->sk_collation = chgcxt->cc_ident_index->rd_indcollation[i];
+		}
 	}
-	index_close(ident_idx_rel, AccessShareLock);
 
-	*nentries = n;
-	return result;
+	chgcxt->cc_file_seq = WORKER_FILE_SNAPSHOT + 1;
 }
 
 static void
-free_index_insert_state(IndexInsertState *iistate)
+release_change_context(ChangeContext *chgcxt)
 {
-	ExecCloseIndices(iistate->rri);
-	FreeExecutorState(iistate->estate);
-	pfree(iistate->rri);
-	pfree(iistate);
+	ExecCloseIndices(chgcxt->cc_rri);
+	FreeExecutorState(chgcxt->cc_estate);
+	/* XXX are these pfrees necessary? */
+	pfree(chgcxt->cc_rri);
+	pfree(chgcxt->cc_ident_key);
 }
 
 static void
@@ -3450,7 +3417,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	Relation   *ind_refs,
 			   *ind_refs_p;
 	int			nind;
-	ChangeDest	chgdst;
+	ChangeContext chgcxt;
 
 	/* Like in cluster_rel(). */
 	lockmode_old = ShareUpdateExclusiveLock;
@@ -3496,12 +3463,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 				errmsg("identity index missing on the new relation"));
 
 	/* Gather information to apply concurrent changes. */
-	chgdst.rel = NewHeap;
-	chgdst.iistate = get_index_insert_state(NewHeap, ident_idx_new,
-											&chgdst.ident_index);
-	chgdst.ident_key = build_identity_key(ident_idx_new, OldHeap,
-										  &chgdst.ident_key_nentries);
-	chgdst.file_seq = WORKER_FILE_SNAPSHOT + 1;
+	initialize_change_context(&chgcxt, NewHeap, ident_idx_new);
 
 	/*
 	 * During testing, wait for another backend to perform concurrent data
@@ -3523,7 +3485,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * hold AccessExclusiveLock. (Quite some amount of WAL could have been
 	 * written during the data copying and index creation.)
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, false);
+	process_concurrent_changes(end_of_wal, &chgcxt, false);
 
 	/*
 	 * Acquire AccessExclusiveLock on the table, its TOAST relation (if there
@@ -3608,7 +3570,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	 * Apply the concurrent changes again. Indicate that the decoding worker
 	 * won't be needed anymore.
 	 */
-	process_concurrent_changes(end_of_wal, &chgdst, true);
+	process_concurrent_changes(end_of_wal, &chgcxt, true);
 
 	/* Remember info about rel before closing OldHeap */
 	relpersistence = OldHeap->rd_rel->relpersistence;
@@ -3659,8 +3621,7 @@ rebuild_relation_finish_concurrent(Relation NewHeap, Relation OldHeap,
 	table_close(NewHeap, NoLock);
 
 	/* Cleanup what we don't need anymore. (And close the identity index.) */
-	pfree(chgdst.ident_key);
-	free_index_insert_state(chgdst.iistate);
+	release_change_context(&chgcxt);
 
 	/*
 	 * Swap the relations and their TOAST relations and TOAST indexes. This
@@ -3980,7 +3941,7 @@ repack_worker_internal(dsm_segment *seg)
 
 	for (;;)
 	{
-		bool	stop = decode_concurrent_changes(decoding_ctx, shared);
+		bool		stop = decode_concurrent_changes(decoding_ctx, shared);
 
 		if (stop)
 			break;
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 72f7c0b992b..12bfd50d25b 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -426,7 +426,7 @@ CatCacheHeader
 CatalogId
 CatalogIdMapEntry
 CatalogIndexState
-ChangeDest
+ChangeContext
 ChangeVarNodes_callback
 ChangeVarNodes_context
 ChannelName
-- 
2.47.3


--gwom7bl7ogtszo4k
Content-Type: text/x-diff; charset=utf-8
Content-Disposition: attachment;
	filename="v44-0006-rename-routines-on-the-logical-output-plugin-sid.patch"



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