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Teach planner how to rearrange join order for some classes of OUTER JOIN.

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Per my recent proposal.  I ended up basing the implementation on the
existing mechanism for enforcing valid join orders of IN joins --- the
rules for valid outer-join orders are somewhat similar.
This commit is contained in:
Tom Lane
2005-12-20 02:30:36 +00:00
parent 1a6aaaa6c4
commit e3b9852728
23 changed files with 969 additions and 722 deletions
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6
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.301 2005/11/22 18:17:26 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.302 2005/12/20 02:30:36 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -45,7 +45,7 @@
#include "optimizer/cost.h"
#include "optimizer/geqo.h"
#include "optimizer/paths.h"
#include "optimizer/prep.h"
#include "optimizer/planmain.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "postmaster/autovacuum.h"
@ -1010,7 +1010,7 @@ static struct config_int ConfigureNamesInt[] =
{"join_collapse_limit", PGC_USERSET, QUERY_TUNING_OTHER,
gettext_noop("Sets the FROM-list size beyond which JOIN constructs are not "
"flattened."),
gettext_noop("The planner will flatten explicit inner JOIN "
gettext_noop("The planner will flatten explicit JOIN "
"constructs into lists of FROM items whenever a list of no more "
"than this many items would result.")
},