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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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7
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 1.272 2004/01/04 03:51:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.273 2004/01/05 05:07:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1168,8 +1168,9 @@ _copyRestrictInfo(RestrictInfo *from)
RestrictInfo *newnode = makeNode(RestrictInfo);
COPY_NODE_FIELD(clause);
COPY_SCALAR_FIELD(ispusheddown);
COPY_SCALAR_FIELD(canjoin);
COPY_SCALAR_FIELD(is_pushed_down);
COPY_SCALAR_FIELD(valid_everywhere);
COPY_SCALAR_FIELD(can_join);
COPY_BITMAPSET_FIELD(clause_relids);
COPY_BITMAPSET_FIELD(left_relids);
COPY_BITMAPSET_FIELD(right_relids);