diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2002-11-19 23:22:00 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2002-11-19 23:22:00 +0000 |
| commit | b60be3f2f8d094da79e04c6eda888f401b09dc39 (patch) | |
| tree | 0590e0647deb5041b8dabcabf03770ebef8e8d43 /src/include/optimizer/planmain.h | |
| parent | 54cb1db6cf4d4bf4e44148582bbd2c99684e7dfd (diff) | |
Add an at-least-marginally-plausible method of estimating the number
of groups produced by GROUP BY. This improves the accuracy of planning
estimates for grouped subselects, and is needed to check whether a
hashed aggregation plan risks memory overflow.
Diffstat (limited to 'src/include/optimizer/planmain.h')
| -rw-r--r-- | src/include/optimizer/planmain.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/src/include/optimizer/planmain.h b/src/include/optimizer/planmain.h index c927d540740..bd4bcddd308 100644 --- a/src/include/optimizer/planmain.h +++ b/src/include/optimizer/planmain.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: planmain.h,v 1.61 2002/11/06 00:00:45 tgl Exp $ + * $Id: planmain.h,v 1.62 2002/11/19 23:22:00 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -35,8 +35,11 @@ extern Sort *make_sort(Query *root, List *tlist, extern Sort *make_sort_from_pathkeys(Query *root, List *tlist, Plan *lefttree, List *pathkeys); extern Agg *make_agg(List *tlist, List *qual, AggStrategy aggstrategy, - int ngrp, AttrNumber *grpColIdx, Plan *lefttree); -extern Group *make_group(List *tlist, int ngrp, AttrNumber *grpColIdx, + int ngrp, AttrNumber *grpColIdx, + long numGroups, int numAggs, + Plan *lefttree); +extern Group *make_group(List *tlist, + int ngrp, AttrNumber *grpColIdx, double numGroups, Plan *lefttree); extern Material *make_material(List *tlist, Plan *lefttree); extern Unique *make_unique(List *tlist, Plan *lefttree, List *distinctList); @@ -54,6 +57,7 @@ extern void build_base_rel_tlists(Query *root, List *tlist); extern Relids distribute_quals_to_rels(Query *root, Node *jtnode); extern void process_implied_equality(Query *root, Node *item1, Node *item2, Oid sortop1, Oid sortop2); +extern bool vars_known_equal(Query *root, Var *var1, Var *var2); /* * prototypes for plan/setrefs.c |