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Allow the planner to collapse explicit inner JOINs together, rather than

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necessarily following the JOIN syntax to develop the query plan.  The old
behavior is still available by setting GUC variable JOIN_COLLAPSE_LIMIT
to 1.  Also create a GUC variable FROM_COLLAPSE_LIMIT to control the
similar decision about when to collapse sub-SELECT lists into their parent
lists.  (This behavior existed already, but the limit was always
GEQO_THRESHOLD/2; now it's separately adjustable.)
This commit is contained in:
Tom Lane
2003-01-25 23:10:30 +00:00
parent 15ab7a8720
commit 9f5f212475
12 changed files with 1035 additions and 873 deletions
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5
src/include/optimizer/prep.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: prep.h,v 1.34 2003/01/20 18:55:05 tgl Exp $
* $Id: prep.h,v 1.35 2003/01/25 23:10:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,6 +20,9 @@
/*
* prototypes for prepjointree.c
*/
extern int from_collapse_limit;
extern int join_collapse_limit;
extern Node *pull_up_IN_clauses(Query *parse, Node *node);
extern Node *pull_up_subqueries(Query *parse, Node *jtnode,
bool below_outer_join);