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Get rid of the rather fuzzily defined FlattenedSubLink node type in favor of

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making pull_up_sublinks() construct a full-blown JoinExpr tree representation
of IN/EXISTS SubLinks that it is able to convert to semi or anti joins.
This makes pull_up_sublinks() a shade more complex, but the gain in semantic
clarity is worth it.  I still have more to do in this area to address the
previously-discussed problems, but this commit in itself fixes at least one
bug in HEAD, as shown by added regression test case.
This commit is contained in:
Tom Lane
2009-02-25 03:30:38 +00:00
parent 7380b6384b
commit e549722a8b
18 changed files with 298 additions and 496 deletions
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16
src/backend/nodes/equalfuncs.c
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@@ -22,7 +22,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.348 2009/02/24 10:06:32 petere Exp $
* $PostgreSQL: pgsql/src/backend/nodes/equalfuncs.c,v 1.349 2009/02/25 03:30:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -766,17 +766,6 @@ _equalRestrictInfo(RestrictInfo *a, RestrictInfo *b)
return true;
}
static bool
_equalFlattenedSubLink(FlattenedSubLink *a, FlattenedSubLink *b)
{
COMPARE_SCALAR_FIELD(jointype);
COMPARE_BITMAPSET_FIELD(lefthand);
COMPARE_BITMAPSET_FIELD(righthand);
COMPARE_NODE_FIELD(quals);
return true;
}
static bool
_equalPlaceHolderVar(PlaceHolderVar *a, PlaceHolderVar *b)
{
@@ -2496,9 +2485,6 @@ equal(void *a, void *b)
case T_RestrictInfo:
retval = _equalRestrictInfo(a, b);
break;
case T_FlattenedSubLink:
retval = _equalFlattenedSubLink(a, b);
break;
case T_PlaceHolderVar:
retval = _equalPlaceHolderVar(a, b);
break;