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Generalize mcv_selectivity() to support both VAR OP CONST and CONST OP VAR

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cases.  This was not needed in the existing uses within selfuncs.c, but if
we're gonna export it for general use, the extra generality seems helpful.
Motivated by looking at ltree example.
This commit is contained in:
Tom Lane
2006-04-27 17:52:40 +00:00
parent afab814a18
commit 0f0a33099c
2 changed files with 17 additions and 16 deletions
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5
src/include/utils/selfuncs.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.31 2006/04/27 00:46:59 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.32 2006/04/27 17:52:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -108,7 +108,8 @@ extern void get_join_variables(PlannerInfo *root, List *args,
VariableStatData *vardata2);
extern double get_variable_numdistinct(VariableStatData *vardata);
extern double mcv_selectivity(VariableStatData *vardata, FmgrInfo *opproc,
Datum constval, double *sumcommonp);
Datum constval, bool varonleft,
double *sumcommonp);
extern Pattern_Prefix_Status pattern_fixed_prefix(Const *patt,
Pattern_Type ptype,