Fix ALTER EXTENSION / SET SCHEMA

In its original conception, it was leaving some objects into the old
schema, but without their proper pg_depend entries; this meant that the
old schema could be dropped, causing future pg_dump calls to fail on the
affected database.  This was originally reported by Jeff Frost as #6704;
there have been other complaints elsewhere that can probably be traced
to this bug.

To fix, be more consistent about altering a table's subsidiary objects
along the table itself; this requires some restructuring in how tables
are relocated when altering an extension -- hence the new
AlterTableNamespaceInternal routine which encapsulates it for both the
ALTER TABLE and the ALTER EXTENSION cases.

There was another bug lurking here, which was unmasked after fixing the
previous one: certain objects would be reached twice via the dependency
graph, and the second attempt to move them would cause the entire
operation to fail.  Per discussion, it seems the best fix for this is to
do more careful tracking of objects already moved: we now maintain a
list of moved objects, to avoid attempting to do it twice for the same
object.

Authors: Alvaro Herrera, Dimitri Fontaine
Reviewed by Tom Lane

src/include/catalog/pg_constraint.h

@@ -20,6 +20,7 @@
 #define PG_CONSTRAINT_H
 
 #include "catalog/genbki.h"
+#include "catalog/dependency.h"
 #include "nodes/pg_list.h"
 
 /* ----------------
@@ -244,7 +245,7 @@ extern char *ChooseConstraintName(const char *name1, const char *name2,
 					 List *others);
 
 extern void AlterConstraintNamespaces(Oid ownerId, Oid oldNspId,
-						  Oid newNspId, bool isType);
+						  Oid newNspId, bool isType, ObjectAddresses *objsMoved);
 extern Oid	get_relation_constraint_oid(Oid relid, const char *conname, bool missing_ok);
 extern Oid	get_domain_constraint_oid(Oid typid, const char *conname, bool missing_ok);
 

src/include/commands/alter.h

@@ -14,13 +14,15 @@
 #ifndef ALTER_H
 #define ALTER_H
 
+#include "catalog/dependency.h"
 #include "nodes/parsenodes.h"
 #include "utils/relcache.h"
 
 extern void ExecRenameStmt(RenameStmt *stmt);
 
 extern void ExecAlterObjectSchemaStmt(AlterObjectSchemaStmt *stmt);
-extern Oid	AlterObjectNamespace_oid(Oid classId, Oid objid, Oid nspOid);
+extern Oid	AlterObjectNamespace_oid(Oid classId, Oid objid, Oid nspOid,
+						 ObjectAddresses *objsMoved);
 extern Oid	AlterObjectNamespace_internal(Relation rel, Oid objid, Oid nspOid);
 
 extern void ExecAlterOwnerStmt(AlterOwnerStmt *stmt);

src/include/commands/tablecmds.h

@@ -15,6 +15,7 @@
 #define TABLECMDS_H
 
 #include "access/htup.h"
+#include "catalog/dependency.h"
 #include "nodes/parsenodes.h"
 #include "storage/lock.h"
 #include "utils/relcache.h"
@@ -36,9 +37,13 @@ extern void AlterTableInternal(Oid relid, List *cmds, bool recurse);
 
 extern void AlterTableNamespace(AlterObjectSchemaStmt *stmt);
 
+extern void AlterTableNamespaceInternal(Relation rel, Oid oldNspOid,
+							Oid nspOid, ObjectAddresses *objsMoved);
+
 extern void AlterRelationNamespaceInternal(Relation classRel, Oid relOid,
 							   Oid oldNspOid, Oid newNspOid,
-							   bool hasDependEntry);
+							   bool hasDependEntry,
+							   ObjectAddresses *objsMoved);
 
 extern void CheckTableNotInUse(Relation rel, const char *stmt);
 

src/include/commands/typecmds.h

@@ -15,6 +15,7 @@
 #define TYPECMDS_H
 
 #include "access/htup.h"
+#include "catalog/dependency.h"
 #include "nodes/parsenodes.h"
 
 
@@ -45,9 +46,10 @@ extern void AlterTypeOwner(List *names, Oid newOwnerId, ObjectType objecttype);
 extern void AlterTypeOwnerInternal(Oid typeOid, Oid newOwnerId,
 					   bool hasDependEntry);
 extern void AlterTypeNamespace(List *names, const char *newschema, ObjectType objecttype);
-extern Oid	AlterTypeNamespace_oid(Oid typeOid, Oid nspOid);
-extern Oid AlterTypeNamespaceInternal(Oid typeOid, Oid nspOid,
+extern Oid	AlterTypeNamespace_oid(Oid typeOid, Oid nspOid, ObjectAddresses *objsMoved);
+extern Oid	AlterTypeNamespaceInternal(Oid typeOid, Oid nspOid,
 						   bool isImplicitArray,
-						   bool errorOnTableType);
+						   bool errorOnTableType,
+						   ObjectAddresses *objsMoved);
 
 #endif   /* TYPECMDS_H */