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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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3
src/include/nodes/nodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.220 2009/02/02 19:31:40 alvherre Exp $
* $PostgreSQL: pgsql/src/include/nodes/nodes.h,v 1.221 2009/02/25 03:30:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -216,7 +216,6 @@ typedef enum NodeTag
T_PathKey,
T_RestrictInfo,
T_InnerIndexscanInfo,
T_FlattenedSubLink,
T_PlaceHolderVar,
T_SpecialJoinInfo,
T_AppendRelInfo,