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Get rid of long-since-vestigial Iter node type, in favor of adding a

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returns-set boolean field in Func and Oper nodes.  This allows cleaner,
more reliable tests for expressions returning sets in the planner and
parser.  For example, a WHERE clause returning a set is now detected
and complained of in the parser, not only at runtime.
This commit is contained in:
Tom Lane
2002-05-12 23:43:04 +00:00
parent f9e4f611a1
commit 3389a110d4
33 changed files with 297 additions and 676 deletions
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8
src/backend/optimizer/path/allpaths.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.84 2002/05/12 20:10:03 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.85 2002/05/12 23:43:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -312,8 +312,8 @@ set_subquery_pathlist(Query *root, RelOptInfo *rel,
* checking that seems more work than it's worth. In any case, a
* plain DISTINCT is safe to push down past.)
*
* 3. If the subquery has any ITER nodes (ie, functions returning sets)
* in its target list, we do not push down any quals, since the quals
* 3. If the subquery has any functions returning sets in its target list,
* we do not push down any quals, since the quals
* might refer to those tlist items, which would mean we'd introduce
* functions-returning-sets into the subquery's WHERE/HAVING quals.
* (It'd be sufficient to not push down quals that refer to those
@ -333,7 +333,7 @@ set_subquery_pathlist(Query *root, RelOptInfo *rel,
subquery->limitOffset == NULL &&
subquery->limitCount == NULL &&
!has_distinct_on_clause(subquery) &&
!contain_iter_clause((Node *) subquery->targetList))
!expression_returns_set((Node *) subquery->targetList))
{
/* OK to consider pushing down individual quals */
List *upperrestrictlist = NIL;