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Tom Lane
3ced8837db
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.