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Improve sublink pullup code to handle ANY/EXISTS sublinks that are at top

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level of a JOIN/ON clause, not only at top level of WHERE.  (However, we
can't do this in an outer join's ON clause, unless the ANY/EXISTS refers
only to the nullable side of the outer join, so that it can effectively
be pushed down into the nullable side.)  Per request from Kevin Grittner.

In passing, fix a bug in the initial implementation of EXISTS pullup:
it would Assert if the EXIST's WHERE clause used a join alias variable.
Since we haven't yet flattened join aliases when this transformation
happens, it's necessary to include join relids in the computed set of
RHS relids.
This commit is contained in:
Tom Lane
2008-08-17 01:20:00 +00:00
parent 909346eff0
commit 19e34b6239
6 changed files with 331 additions and 109 deletions
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6
src/include/optimizer/prep.h
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@@ -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/optimizer/prep.h,v 1.61 2008/08/14 18:48:00 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/prep.h,v 1.62 2008/08/17 01:20:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,12 +21,12 @@
/*
* prototypes for prepjointree.c
*/
extern Node *pull_up_sublinks(PlannerInfo *root, Node *node);
extern void pull_up_sublinks(PlannerInfo *root);
extern void inline_set_returning_functions(PlannerInfo *root);
extern Node *pull_up_subqueries(PlannerInfo *root, Node *jtnode,
bool below_outer_join, bool append_rel_member);
extern void reduce_outer_joins(PlannerInfo *root);
extern Relids get_relids_in_jointree(Node *jtnode);
extern Relids get_relids_in_jointree(Node *jtnode, bool include_joins);
extern Relids get_relids_for_join(PlannerInfo *root, int joinrelid);
/*

12
src/include/optimizer/subselect.h
View File

@@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.32 2008/08/14 18:48:00 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/subselect.h,v 1.33 2008/08/17 01:20:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -15,9 +15,13 @@
#include "nodes/plannodes.h"
#include "nodes/relation.h"
extern Node *convert_ANY_sublink_to_join(PlannerInfo *root, SubLink *sublink);
extern Node *convert_EXISTS_sublink_to_join(PlannerInfo *root,
SubLink *sublink, bool under_not);
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 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,