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IN clauses appearing at top level of WHERE can now be handled as joins.

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There are two implementation techniques: the executor understands a new
JOIN_IN jointype, which emits at most one matching row per left-hand row,
or the result of the IN's sub-select can be fed through a DISTINCT filter
and then joined as an ordinary relation.
Along the way, some minor code cleanup in the optimizer; notably, break
out most of the jointree-rearrangement preprocessing in planner.c and
put it in a new file prep/prepjointree.c.
This commit is contained in:
Tom Lane
2003-01-20 18:55:07 +00:00
parent be2b660ecd
commit bdfbfde1b1
47 changed files with 2075 additions and 875 deletions
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26
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.236 2003/01/15 19:35:35 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.237 2003/01/20 18:54:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1095,6 +1095,21 @@ _copyJoinInfo(JoinInfo *from)
return newnode;
}
/*
* _copyInClauseInfo
*/
static InClauseInfo *
_copyInClauseInfo(InClauseInfo *from)
{
InClauseInfo *newnode = makeNode(InClauseInfo);
COPY_INTLIST_FIELD(lefthand);
COPY_INTLIST_FIELD(righthand);
COPY_NODE_FIELD(sub_targetlist);
return newnode;
}
/* ****************************************************************
* parsenodes.h copy functions
* ****************************************************************
@ -1424,9 +1439,9 @@ _copyQuery(Query *from)
/*
* We do not copy the planner internal fields: base_rel_list,
* other_rel_list, join_rel_list, equi_key_list, query_pathkeys,
* hasJoinRTEs. That would get us into copying RelOptInfo/Path
* trees, which we don't want to do.
* other_rel_list, join_rel_list, equi_key_list, in_info_list,
* query_pathkeys, hasJoinRTEs. That would get us into copying
* RelOptInfo/Path trees, which we don't want to do.
*/
return newnode;
@ -2490,6 +2505,9 @@ copyObject(void *from)
case T_JoinInfo:
retval = _copyJoinInfo(from);
break;
case T_InClauseInfo:
retval = _copyInClauseInfo(from);
break;
/*
* VALUE NODES