diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-01-20 20:45:41 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-01-20 20:45:41 +0000 |
| commit | f41803bb39bc2949db200116a609fd242d0ec221 (patch) | |
| tree | 2c81bcf712ab8b46133c2f50bbee34b2b3ea7129 /src/backend/optimizer/prep/prepjointree.c | |
| parent | 2b7334d4877ba445003f96b0bb7eed4e7078a39b (diff) | |
Refactor planner's pathkeys data structure to create a separate, explicit
representation of equivalence classes of variables. This is an extensive
rewrite, but it brings a number of benefits:
* planner no longer fails in the presence of "incomplete" operator families
that don't offer operators for every possible combination of datatypes.
* avoid generating and then discarding redundant equality clauses.
* remove bogus assumption that derived equalities always use operators
named "=".
* mergejoins can work with a variety of sort orders (e.g., descending) now,
instead of tying each mergejoinable operator to exactly one sort order.
* better recognition of redundant sort columns.
* can make use of equalities appearing underneath an outer join.
Diffstat (limited to 'src/backend/optimizer/prep/prepjointree.c')
| -rw-r--r-- | src/backend/optimizer/prep/prepjointree.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/backend/optimizer/prep/prepjointree.c b/src/backend/optimizer/prep/prepjointree.c index 1c2253a7797..ce6f9cc38e4 100644 --- a/src/backend/optimizer/prep/prepjointree.c +++ b/src/backend/optimizer/prep/prepjointree.c @@ -15,7 +15,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.45 2007/01/05 22:19:32 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.46 2007/01/20 20:45:39 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -292,6 +292,7 @@ pull_up_simple_subquery(PlannerInfo *root, Node *jtnode, RangeTblEntry *rte, */ subroot = makeNode(PlannerInfo); subroot->parse = subquery; + subroot->planner_cxt = CurrentMemoryContext; subroot->in_info_list = NIL; subroot->append_rel_list = NIL; |