Tom Lane 4e5fbb34b3 Change the division of labor between grouping_planner and query_planner ... so that the latter estimates the number of groups that grouping will produce. This is needed because it is primarily query_planner that makes the decision between fast-start and fast-finish plans, and in the original coding it was unable to make more than a crude rule-of-thumb choice when the query involved grouping. This revision helps us make saner choices for queries like SELECT ... GROUP BY ... LIMIT, as in a recent example from Mark Kirkwood. Also move the responsibility for canonicalizing sort_pathkeys and group_pathkeys into query_planner; this information has to be available anyway to support the first change, and doing it this way lets us get rid of compare_noncanonical_pathkeys entirely.		2005-08-27 22:13:44 +00:00
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clauses.h	Teach the planner to remove SubqueryScan nodes from the plan if they	2005-05-22 22:30:20 +00:00
cost.h	enable_constraint_exclusion => constraint_exclusion	2005-08-22 17:35:03 +00:00
geqo.h	Remove planner's private fields from Query struct, and put them into	2005-06-05 22:32:58 +00:00
geqo_copy.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_gene.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_misc.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_mutation.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_pool.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_random.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_recombination.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
geqo_selection.h	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
joininfo.h	Simplify the planner's join clause management by storing join clauses	2005-06-09 04:19:00 +00:00
pathnode.h	Remove planner's private fields from Query struct, and put them into	2005-06-05 22:32:58 +00:00
paths.h	Change the division of labor between grouping_planner and query_planner	2005-08-27 22:13:44 +00:00
plancat.h	Simple constraint exclusion. For now, only child tables of inheritance	2005-07-23 21:05:48 +00:00
planmain.h	Change the division of labor between grouping_planner and query_planner	2005-08-27 22:13:44 +00:00
planner.h	Remove planner's private fields from Query struct, and put them into	2005-06-05 22:32:58 +00:00
predtest.h	Simple constraint exclusion. For now, only child tables of inheritance	2005-07-23 21:05:48 +00:00
prep.h	If a LIMIT is applied to a UNION ALL query, plan each UNION arm as	2005-06-10 02:21:05 +00:00
restrictinfo.h	Fix a bunch of bad interactions between partial indexes and the new	2005-07-28 20:26:22 +00:00
subselect.h	Remove planner's private fields from Query struct, and put them into	2005-06-05 22:32:58 +00:00
tlist.h	Merge Resdom nodes into TargetEntry nodes to simplify code and save a	2005-04-06 16:34:07 +00:00
var.h	Remove planner's private fields from Query struct, and put them into	2005-06-05 22:32:58 +00:00