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Add the ability to extract OR indexscan conditions from OR-of-AND

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join conditions in which each OR subclause includes a constraint on
the same relation.  This implements the other useful side-effect of
conversion to CNF format, without its unpleasant side-effects.  As
per pghackers discussion of a few weeks ago.
This commit is contained in:
Tom Lane
2004-01-05 05:07:36 +00:00
parent bf488a6842
commit 9091e8d1b2
16 changed files with 438 additions and 295 deletions
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5
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 1.211 2003/12/30 23:53:14 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.212 2004/01/05 05:07:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -560,7 +560,8 @@ static bool
_equalRestrictInfo(RestrictInfo *a, RestrictInfo *b)
{
COMPARE_NODE_FIELD(clause);
COMPARE_SCALAR_FIELD(ispusheddown);
COMPARE_SCALAR_FIELD(is_pushed_down);
COMPARE_SCALAR_FIELD(valid_everywhere);
/*
* We ignore all the remaining fields, since they may not be set yet,