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Tom Lane 3ced8837db Simplify query_planner's API by having it return the top-level RelOptInfo. ... Formerly, query_planner returned one or possibly two Paths for the topmost join relation, so that grouping_planner didn't see the join RelOptInfo (at least not directly; it didn't have any hesitation about examining cheapest_path->parent, though). However, correct selection of the Paths involved a significant amount of coupling between query_planner and grouping_planner, a problem which has gotten worse over time. It seems best to give up on this API choice and instead return the topmost RelOptInfo explicitly. Then grouping_planner can pull out the Paths it wants from the rel's path list. In this way we can remove all knowledge of grouping behaviors from query_planner. The only real benefit of the old way is that in the case of an empty FROM clause, we never made any RelOptInfos at all, just a Path. Now we have to gin up a dummy RelOptInfo to represent the empty FROM clause. That's not a very big deal though. While at it, simplify query_planner's API a bit more by having the caller set up root->tuple_fraction and root->limit_tuples, rather than passing those values as separate parameters. Since query_planner no longer does anything with either value, requiring it to fill the PlannerInfo fields seemed pretty arbitrary. This patch just rearranges code; it doesn't (intentionally) change any behaviors. Followup patches will do more interesting things.		13 years ago
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Makefile	Remove cvs keywords from all files.	15 years ago
clauses.c	Add SQL Standard WITH ORDINALITY support for UNNEST (and any other SRF)	13 years ago
joininfo.c	Update copyrights for 2013	13 years ago
pathnode.c	pgindent run for release 9.3	13 years ago
placeholder.c	Update copyrights for 2013	13 years ago
plancat.c	Arrange to cache FdwRoutine structs in foreign tables' relcache entries.	13 years ago
predtest.c	Update copyrights for 2013	13 years ago
relnode.c	Simplify query_planner's API by having it return the top-level RelOptInfo.	13 years ago
restrictinfo.c	Update copyrights for 2013	13 years ago
tlist.c	Avoid inserting Result nodes that only compute identity projections.	13 years ago
var.c	Change post-rewriter representation of dropped columns in joinaliasvars.	13 years ago