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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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5
src/include/nodes/pg_list.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: pg_list.h,v 1.30 2002/11/24 21:52:15 tgl Exp $
* $Id: pg_list.h,v 1.31 2003/01/20 18:55:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -145,7 +145,8 @@ extern List *set_intersecti(List *list1, List *list2);
extern bool equali(List *list1, List *list2);
extern bool sameseti(List *list1, List *list2);
extern bool nonoverlap_setsi(List *list1, List *list2);
extern bool overlap_setsi(List *list1, List *list2);
#define nonoverlap_setsi(list1, list2) (!overlap_setsi(list1, list2))
extern bool is_subseti(List *list1, List *list2);
extern void freeList(List *list);