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Get rid of the rather fuzzily defined FlattenedSubLink node type in favor of

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making pull_up_sublinks() construct a full-blown JoinExpr tree representation
of IN/EXISTS SubLinks that it is able to convert to semi or anti joins.
This makes pull_up_sublinks() a shade more complex, but the gain in semantic
clarity is worth it.  I still have more to do in this area to address the
previously-discussed problems, but this commit in itself fixes at least one
bug in HEAD, as shown by added regression test case.
This commit is contained in:
Tom Lane
2009-02-25 03:30:38 +00:00
parent 7380b6384b
commit e549722a8b
18 changed files with 298 additions and 496 deletions
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16
src/include/optimizer/subselect.h
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@@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.35 2009/01/01 17:24:00 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.36 2009/02/25 03:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,13 +16,13 @@
#include "nodes/relation.h"
extern void SS_process_ctes(PlannerInfo *root);
extern bool convert_ANY_sublink_to_join(PlannerInfo *root, SubLink *sublink,
Relids available_rels,
Node **new_qual, List **fromlist);
extern bool convert_EXISTS_sublink_to_join(PlannerInfo *root, SubLink *sublink,
bool under_not,
Relids available_rels,
Node **new_qual, List **fromlist);
extern JoinExpr *convert_ANY_sublink_to_join(PlannerInfo *root,
SubLink *sublink,
Relids available_rels);
extern JoinExpr *convert_EXISTS_sublink_to_join(PlannerInfo *root,
SubLink *sublink,
bool under_not,
Relids available_rels);
extern Node *SS_replace_correlation_vars(PlannerInfo *root, Node *expr);
extern Node *SS_process_sublinks(PlannerInfo *root, Node *expr, bool isQual);
extern void SS_finalize_plan(PlannerInfo *root, Plan *plan,