From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Subject: [PATCH v2] WIP: don't let constraint indexes attach to raw indexes
Date: Fri, 28 Jun 2024 13:16:03 +0200
Probably for master only, since we probably don't want to prohibit
working behavior in backbranches. In backbranches we'll have to cope
with the possibility that a hierarchy such as the one being forbidded
here already exists. We may also want to do something about this during
pg_upgrade.
---
src/backend/commands/indexcmds.c | 24 ++++++++++++++++-----
src/backend/commands/tablecmds.c | 37 +++++++++++++++++++++++++++++---
2 files changed, 53 insertions(+), 8 deletions(-)
inline patch 1: src/backend/commands/indexcmds.c, src/backend/commands/tablecmds.c (+53/-8 lines) download inline-1.patchdiff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.cindex 309389e20d..50205b9bdb 100644--- a/src/backend/commands/indexcmds.c+++ b/src/backend/commands/indexcmds.c@@ -1378,7 +1378,11 @@ DefineIndex(Oid tableId,
parentIndex->rd_opfamily,
attmap))
{
- Oid cldConstrOid = InvalidOid;+ Oid cldConstrOid;++ cldConstrOid =+ get_relation_idx_constraint_oid(childRelid,+ cldidxid);
/*
* Found a match.
@@ -1387,19 +1391,29 @@ DefineIndex(Oid tableId,
* because of a constraint, then the child needs to
* have a constraint also, so look for one. If there
* is no such constraint, this index is no good, so
- * keep looking.+ * keep looking. On the other hand, if the index that+ * exists on the child _is_ a constraint but this one+ * isn't, then we shouldn't match them. XXX should we+ * instead choose to ignore the index?
*/
if (createdConstraintId != InvalidOid)
{
- cldConstrOid =- get_relation_idx_constraint_oid(childRelid,- cldidxid);
if (cldConstrOid == InvalidOid)
{
index_close(cldidx, lockmode);
continue;
}
}
+ else if (OidIsValid(cldConstrOid))+ ereport(ERROR,+ errcode(ERRCODE_INVALID_OBJECT_DEFINITION),+ errmsg("can't create index on partitioned table \"%s\" matching constraint \"%s\" on partition \"%s\"",+ RelationGetRelationName(rel),+ get_constraint_name(cldConstrOid),+ RelationGetRelationName(childrel)),+ errhint("You can create the index on ONLY \"%s\", or create a constraint instead.",+ RelationGetRelationName(rel)));+
/* Attach index to parent and we're done. */
IndexSetParentIndex(cldidx, indexRelationId);
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.cindex 66cda26a25..8cb9893e5d 100644--- a/src/backend/commands/tablecmds.c+++ b/src/backend/commands/tablecmds.c@@ -18757,6 +18757,10 @@ AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
idxRel->rd_opfamily,
attmap))
{
+ cldConstrOid =+ get_relation_idx_constraint_oid(RelationGetRelid(attachrel),+ cldIdxId);+
/*
* If this index is being created in the parent because of a
* constraint, then the child needs to have a constraint also,
@@ -18765,9 +18769,6 @@ AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
*/
if (OidIsValid(constraintOid))
{
- cldConstrOid =- get_relation_idx_constraint_oid(RelationGetRelid(attachrel),- cldIdxId);
/* no dice */
if (!OidIsValid(cldConstrOid))
continue;
@@ -18777,6 +18778,22 @@ AttachPartitionEnsureIndexes(List **wqueue, Relation rel, Relation attachrel)
get_constraint_type(cldConstrOid))
continue;
}
+ else+ {+ /*+ * If the parent does *not* have a constraint, then the+ * child must also not have one. Otherwise, things can get+ * ugly by detach time.+ */++ if (OidIsValid(cldConstrOid))+ ereport(ERROR,+ errcode(ERRCODE_INVALID_OBJECT_DEFINITION),+ errmsg("can't attach partition \"%s\" with constraint \"%s\" that matches non-constraint index \"%s\"",+ RelationGetRelationName(attachrel),+ get_constraint_name(cldConstrOid),+ RelationGetRelationName(idxRel)));+ }
/* bingo. */
IndexSetParentIndex(attachrelIdxRels[i], idx);
@@ -19726,6 +19743,20 @@ ATExecAttachPartitionIdx(List **wqueue, Relation parentIdx, RangeVar *name)
RelationGetRelationName(parentTbl),
RelationGetRelationName(partIdx))));
}
+ else+ {+ Oid constroid;++ constroid = get_relation_idx_constraint_oid(RelationGetRelid(partTbl),+ partIdxId);++ if (OidIsValid(constroid))+ ereport(ERROR,+ errcode(ERRCODE_INVALID_OBJECT_DEFINITION),+ errmsg("can't attach constraint-supporting index \"%s\" to non-constraint index \"%s\"",+ get_constraint_name(constroid),+ RelationGetRelationName(partIdx)));+ }
/* All good -- do it */
IndexSetParentIndex(partIdx, RelationGetRelid(parentIdx));
--
2.39.2
--q72ne4r752oxakpn--
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To: pgsql-bugs@postgresql.org
Cc: alvherre@alvh.no-ip.org
Subject: Re: [PATCH v2] WIP: don't let constraint indexes attach to raw indexes
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