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Teach planner to convert simple UNION ALL subqueries into append relations,

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thereby sharing code with the inheritance case.  This puts the UNION-ALL-view
approach to partitioned tables on par with inheritance, so far as constraint
exclusion is concerned: it works either way.  (Still need to update the docs
to say so.)  The definition of "simple UNION ALL" is a little simpler than
I would like --- basically the union arms can only be SELECT * FROM foo
--- but it's good enough for partitioned-table cases.
This commit is contained in:
Tom Lane
2006-02-03 21:08:49 +00:00
parent a25b1decef
commit 8b109ebf14
10 changed files with 888 additions and 388 deletions
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4
src/include/optimizer/tlist.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/tlist.h,v 1.42 2005/04/06 16:34:07 tgl Exp $
* $PostgreSQL: pgsql/src/include/optimizer/tlist.h,v 1.43 2006/02/03 21:08:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -29,4 +29,6 @@ extern Node *get_sortgroupclause_expr(SortClause *sortClause,
extern List *get_sortgrouplist_exprs(List *sortClauses,
List *targetList);
extern bool tlist_same_datatypes(List *tlist, List *colTypes, bool junkOK);
#endif /* TLIST_H */