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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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21
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.322 2005/11/26 22:14:56 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.323 2005/12/20 02:30:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1277,6 +1277,22 @@ _copyRestrictInfo(RestrictInfo *from)
return newnode;
}
/*
* _copyOuterJoinInfo
*/
static OuterJoinInfo *
_copyOuterJoinInfo(OuterJoinInfo *from)
{
OuterJoinInfo *newnode = makeNode(OuterJoinInfo);
COPY_BITMAPSET_FIELD(min_lefthand);
COPY_BITMAPSET_FIELD(min_righthand);
COPY_SCALAR_FIELD(is_full_join);
COPY_SCALAR_FIELD(lhs_strict);
return newnode;
}
/*
* _copyInClauseInfo
*/
@ -2906,6 +2922,9 @@ copyObject(void *from)
case T_RestrictInfo:
retval = _copyRestrictInfo(from);
break;
case T_OuterJoinInfo:
retval = _copyOuterJoinInfo(from);
break;
case T_InClauseInfo:
retval = _copyInClauseInfo(from);
break;