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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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16
src/backend/nodes/equalfuncs.c
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@@ -18,7 +18,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.258 2005/11/22 18:17:11 momjian Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.259 2005/12/20 02:30:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -613,6 +613,17 @@ _equalRestrictInfo(RestrictInfo *a, RestrictInfo *b)
return true;
}
static bool
_equalOuterJoinInfo(OuterJoinInfo *a, OuterJoinInfo *b)
{
COMPARE_BITMAPSET_FIELD(min_lefthand);
COMPARE_BITMAPSET_FIELD(min_righthand);
COMPARE_SCALAR_FIELD(is_full_join);
COMPARE_SCALAR_FIELD(lhs_strict);
return true;
}
static bool
_equalInClauseInfo(InClauseInfo *a, InClauseInfo *b)
{
@@ -1954,6 +1965,9 @@ equal(void *a, void *b)
case T_RestrictInfo:
retval = _equalRestrictInfo(a, b);
break;
case T_OuterJoinInfo:
retval = _equalOuterJoinInfo(a, b);
break;
case T_InClauseInfo:
retval = _equalInClauseInfo(a, b);
break;