Fix CREATE TABLE ... LIKE ... INCLUDING INDEXES to not cause unwanted

tablespace permissions failures when copying an index that is in the
database's default tablespace.  A side-effect of the change is that explicitly
specifying the default tablespace no longer triggers a permissions check;
this is not how it was done in pre-8.3 releases but is argued to be more
consistent.  Per bug #3921 from Andrew Gilligan.  (Note: I argued in the
subsequent discussion that maybe LIKE shouldn't copy index tablespaces
at all, but since no one indicated agreement with that idea, I've refrained
from doing it.)

src/backend/commands/indexcmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/indexcmds.c,v 1.170 2008/01/09 21:52:36 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/indexcmds.c,v 1.171 2008/02/07 17:09:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -215,7 +215,7 @@ DefineIndex(RangeVar *heapRelation,
 	}
 
 	/* Check permissions except when using database's default */
-	if (OidIsValid(tablespaceId))
+	if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
 	{
 		AclResult	aclresult;
 

src/backend/commands/tablecmds.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.241 2008/01/30 19:46:48 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.242 2008/02/07 17:09:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -340,7 +340,7 @@ DefineRelation(CreateStmt *stmt, char relkind)
 	}
 
 	/* Check permissions except when using database's default */
-	if (OidIsValid(tablespaceId))
+	if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
 	{
 		AclResult	aclresult;
 

src/backend/executor/execMain.c

@@ -26,7 +26,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.302 2008/01/01 19:45:49 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/executor/execMain.c,v 1.303 2008/02/07 17:09:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2594,7 +2594,7 @@ OpenIntoRel(QueryDesc *queryDesc)
 	}
 
 	/* Check permissions except when using the database's default space */
-	if (OidIsValid(tablespaceId))
+	if (OidIsValid(tablespaceId) && tablespaceId != MyDatabaseTableSpace)
 	{
 		AclResult	aclresult;
 

src/backend/parser/parse_utilcmd.c

@@ -19,7 +19,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- *	$PostgreSQL: pgsql/src/backend/parser/parse_utilcmd.c,v 2.8 2008/01/01 19:45:51 momjian Exp $
+ *	$PostgreSQL: pgsql/src/backend/parser/parse_utilcmd.c,v 2.9 2008/02/07 17:09:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -767,7 +767,10 @@ generateClonedIndexStmt(CreateStmtContext *cxt, Relation source_idx,
 	index = makeNode(IndexStmt);
 	index->relation = cxt->relation;
 	index->accessMethod = pstrdup(NameStr(amrec->amname));
-	index->tableSpace = get_tablespace_name(source_idx->rd_node.spcNode);
+	if (OidIsValid(idxrelrec->reltablespace))
+		index->tableSpace = get_tablespace_name(idxrelrec->reltablespace);
+	else
+		index->tableSpace = NULL;
 	index->unique = idxrec->indisunique;
 	index->primary = idxrec->indisprimary;
 	index->concurrent = false;

src/include/nodes/parsenodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.358 2008/01/01 19:45:58 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.359 2008/02/07 17:09:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1537,7 +1537,7 @@ typedef struct IndexStmt
 	char	   *idxname;		/* name of new index, or NULL for default */
 	RangeVar   *relation;		/* relation to build index on */
 	char	   *accessMethod;	/* name of access method (eg. btree) */
-	char	   *tableSpace;		/* tablespace, or NULL to use parent's */
+	char	   *tableSpace;		/* tablespace, or NULL for default */
 	List	   *indexParams;	/* a list of IndexElem */
 	List	   *options;		/* options from WITH clause */
 	Node	   *whereClause;	/* qualification (partial-index predicate) */