Subject: [PATCH v17 2/7] Add pg_depend.refobjversion.

From: Thomas Munro <[email-masked]>
Date: Tue, 28 May 2019 14:16:03 -0400

Provide a place for the version of referenced database objects to be
recorded.  Later commits will be able to use this to record dependencies
on collation versions for indexes and perhaps more things later.

Author: Thomas Munro
Reviewed-by: Julien Rouhaud, Peter Eisentraut and Michael Paquier
Discussion: https://postgr.es/m/CAEepm%3D0uEQCpfq_%2BLYFBdArCe4Ot98t1aR4eYiYTe%3DyavQygiQ%40mail.gmail.com
---
 doc/src/sgml/catalogs.sgml                | 12 ++++++-
 src/backend/catalog/dependency.c          | 14 +++++---
 src/backend/catalog/pg_depend.c           | 14 +++++---
 src/bin/initdb/initdb.c                   | 44 +++++++++++------------
 src/include/catalog/dependency.h          |  1 +
 src/include/catalog/pg_depend.h           |  4 +++
 src/include/catalog/toasting.h            |  1 +
 src/test/regress/expected/misc_sanity.out |  4 +--
 8 files changed, 61 insertions(+), 33 deletions(-)

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index c2d33c76e0..4dacebf8c9 100644
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -2950,6 +2950,17 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
       </entry>
      </row>
 
+     <row>
+      <entry><structfield>refobjversion</structfield></entry>
+      <entry><type>text</type></entry>
+      <entry></entry>
+      <entry>
+       An optional version for the referenced object.  The only current use of
+       <structfield>refobjversion</structfield> is to record dependencies
+       between indexes and collation versions.
+      </entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -3115,7 +3126,6 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
    dependencies' restrictions about which objects must be dropped together
    must be satisfied.
   </para>
-
  </sect1>

diff --git a/src/backend/catalog/dependency.c b/src/backend/catalog/dependency.c
index ffd52c1153..281f5b7c28 100644
--- a/src/backend/catalog/dependency.c
+++ b/src/backend/catalog/dependency.c
@@ -1603,7 +1603,9 @@ recordDependencyOnExpr(const ObjectAddress *depender,
 
 	/* And record 'em */
 	recordMultipleDependencies(depender,
-							   context.addrs->refs, context.addrs->numrefs,
+							   context.addrs->refs,
+							   context.addrs->numrefs,
+							   NULL,
 							   behavior);
 
 	free_object_addresses(context.addrs);
@@ -1690,7 +1692,9 @@ recordDependencyOnSingleRelExpr(const ObjectAddress *depender,
 		/* Record the self-dependencies with the appropriate direction */
 		if (!reverse_self)
 			recordMultipleDependencies(depender,
-									   self_addrs->refs, self_addrs->numrefs,
+									   self_addrs->refs,
+									   self_addrs->numrefs,
+									   NULL,
 									   self_behavior);
 		else
 		{
@@ -1710,7 +1714,9 @@ recordDependencyOnSingleRelExpr(const ObjectAddress *depender,
 
 	/* Record the external dependencies */
 	recordMultipleDependencies(depender,
-							   context.addrs->refs, context.addrs->numrefs,
+							   context.addrs->refs,
+							   context.addrs->numrefs,
+							   NULL,
 							   behavior);
 
 	free_object_addresses(context.addrs);
@@ -2682,7 +2688,7 @@ record_object_address_dependencies(const ObjectAddress *depender,
 {
 	eliminate_duplicate_dependencies(referenced);
 	recordMultipleDependencies(depender,
-							   referenced->refs, referenced->numrefs,
+							   referenced->refs, referenced->numrefs, NULL,
 							   behavior);
 }
 
diff --git a/src/backend/catalog/pg_depend.c b/src/backend/catalog/pg_depend.c
index 596dafe19c..84a0b99311 100644
--- a/src/backend/catalog/pg_depend.c
+++ b/src/backend/catalog/pg_depend.c
@@ -24,6 +24,7 @@
 #include "catalog/pg_extension.h"
 #include "commands/extension.h"
 #include "miscadmin.h"
+#include "utils/builtins.h"
 #include "utils/fmgroids.h"
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
@@ -44,7 +45,7 @@ recordDependencyOn(const ObjectAddress *depender,
 				   const ObjectAddress *referenced,
 				   DependencyType behavior)
 {
-	recordMultipleDependencies(depender, referenced, 1, behavior);
+	recordMultipleDependencies(depender, referenced, 1, NULL, behavior);
 }
 
 /*
@@ -55,6 +56,7 @@ void
 recordMultipleDependencies(const ObjectAddress *depender,
 						   const ObjectAddress *referenced,
 						   int nreferenced,
+						   const char *version,
 						   DependencyType behavior)
 {
 	Relation	dependDesc;
@@ -79,8 +81,6 @@ recordMultipleDependencies(const ObjectAddress *depender,
 	/* Don't open indexes unless we need to make an update */
 	indstate = NULL;
 
-	memset(nulls, false, sizeof(nulls));
-
 	for (i = 0; i < nreferenced; i++, referenced++)
 	{
 		/*
@@ -94,6 +94,9 @@ recordMultipleDependencies(const ObjectAddress *depender,
 			 * Record the Dependency.  Note we don't bother to check for
 			 * duplicate dependencies; there's no harm in them.
 			 */
+			memset(nulls, false, sizeof(nulls));
+			memset(values, 0, sizeof(values));
+
 			values[Anum_pg_depend_classid - 1] = ObjectIdGetDatum(depender->classId);
 			values[Anum_pg_depend_objid - 1] = ObjectIdGetDatum(depender->objectId);
 			values[Anum_pg_depend_objsubid - 1] = Int32GetDatum(depender->objectSubId);
@@ -101,9 +104,12 @@ recordMultipleDependencies(const ObjectAddress *depender,
 			values[Anum_pg_depend_refclassid - 1] = ObjectIdGetDatum(referenced->classId);
 			values[Anum_pg_depend_refobjid - 1] = ObjectIdGetDatum(referenced->objectId);
 			values[Anum_pg_depend_refobjsubid - 1] = Int32GetDatum(referenced->objectSubId);
+			if (version)
+				values[Anum_pg_depend_refobjversion - 1] = CStringGetTextDatum(version);
+			else
+				nulls[Anum_pg_depend_refobjversion - 1] = true;
 
 			values[Anum_pg_depend_deptype - 1] = CharGetDatum((char) behavior);
-
 			tup = heap_form_tuple(dependDesc->rd_att, values, nulls);
 
 			/* fetch index info only when we know we need it */
diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
index a6577486ce..b7e01a4678 100644
--- a/src/bin/initdb/initdb.c
+++ b/src/bin/initdb/initdb.c
@@ -1560,55 +1560,55 @@ setup_depend(FILE *cmdfd)
 		"DELETE FROM pg_shdepend;\n\n",
 		"VACUUM pg_shdepend;\n\n",
 
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_class;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_proc;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_type;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_cast;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_constraint;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_conversion;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_attrdef;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_language;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_operator;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_opclass;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_opfamily;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_am;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_amop;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_amproc;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_rewrite;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_trigger;\n\n",
 
 		/*
 		 * restriction here to avoid pinning the public namespace
 		 */
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_namespace "
 		"    WHERE nspname LIKE 'pg%';\n\n",
 
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_ts_parser;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_ts_dict;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_ts_template;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_ts_config;\n\n",
-		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p' "
+		"INSERT INTO pg_depend SELECT 0,0,0, tableoid,oid,0, 'p',NULL"
 		" FROM pg_collation;\n\n",
 		"INSERT INTO pg_shdepend SELECT 0,0,0,0, tableoid,oid, 'p' "
 		" FROM pg_authid;\n\n",
diff --git a/src/include/catalog/dependency.h b/src/include/catalog/dependency.h
index ab5e92bdc6..62e86a19b6 100644
--- a/src/include/catalog/dependency.h
+++ b/src/include/catalog/dependency.h
@@ -185,6 +185,7 @@ extern void recordDependencyOn(const ObjectAddress *depender,
 extern void recordMultipleDependencies(const ObjectAddress *depender,
 									   const ObjectAddress *referenced,
 									   int nreferenced,
+									   const char *version,
 									   DependencyType behavior);
 
 extern void recordDependencyOnCurrentExtension(const ObjectAddress *object,
diff --git a/src/include/catalog/pg_depend.h b/src/include/catalog/pg_depend.h
index ccf0a98330..7489022795 100644
--- a/src/include/catalog/pg_depend.h
+++ b/src/include/catalog/pg_depend.h
@@ -61,6 +61,10 @@ CATALOG(pg_depend,2608,DependRelationId)
 	 * field.  See DependencyType in catalog/dependency.h.
 	 */
 	char		deptype;		/* see codes in dependency.h */
+#ifdef CATALOG_VARLEN
+	text		refobjversion;	/* version tracking, NULL if not used or
+								 * unknown */
+#endif
 } FormData_pg_depend;
 
 /* ----------------
diff --git a/src/include/catalog/toasting.h b/src/include/catalog/toasting.h
index 8f131893dc..e320d82203 100644
--- a/src/include/catalog/toasting.h
+++ b/src/include/catalog/toasting.h
@@ -53,6 +53,7 @@ DECLARE_TOAST(pg_aggregate, 4159, 4160);
 DECLARE_TOAST(pg_attrdef, 2830, 2831);
 DECLARE_TOAST(pg_constraint, 2832, 2833);
 DECLARE_TOAST(pg_default_acl, 4143, 4144);
+DECLARE_TOAST(pg_depend, 8888, 8889);
 DECLARE_TOAST(pg_description, 2834, 2835);
 DECLARE_TOAST(pg_event_trigger, 4145, 4146);
 DECLARE_TOAST(pg_extension, 4147, 4148);
diff --git a/src/test/regress/expected/misc_sanity.out b/src/test/regress/expected/misc_sanity.out
index 8538173ff8..d40afeef78 100644
--- a/src/test/regress/expected/misc_sanity.out
+++ b/src/test/regress/expected/misc_sanity.out
@@ -18,8 +18,8 @@ WHERE refclassid = 0 OR refobjid = 0 OR
       deptype NOT IN ('a', 'e', 'i', 'n', 'p') OR
       (deptype != 'p' AND (classid = 0 OR objid = 0)) OR
       (deptype = 'p' AND (classid != 0 OR objid != 0 OR objsubid != 0));
- classid | objid | objsubid | refclassid | refobjid | refobjsubid | deptype 
----------+-------+----------+------------+----------+-------------+---------
+ classid | objid | objsubid | refclassid | refobjid | refobjsubid | deptype | refobjversion 
+---------+-------+----------+------------+----------+-------------+---------+---------------
 (0 rows)
 
 -- **************** pg_shdepend ****************
-- 
2.20.1

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