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Make use of statistics on index expressions. There are still some

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corner cases that could stand improvement, but it does all the basic
stuff.  A byproduct is that the selectivity routines are no longer
constrained to working on simple Vars; we might in future be able to
improve the behavior for subexpressions that don't match indexes.
This commit is contained in:
Tom Lane
2004-02-17 00:52:53 +00:00
parent d372bba02d
commit a536ed53bc
5 changed files with 1108 additions and 1025 deletions
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5
src/include/utils/selfuncs.h
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.16 2003/11/29 22:41:16 pgsql Exp $
* $PostgreSQL: pgsql/src/include/utils/selfuncs.h,v 1.17 2004/02/17 00:52:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -77,6 +77,9 @@ extern void mergejoinscansel(Query *root, Node *clause,
extern double estimate_num_groups(Query *root, List *groupExprs,
double input_rows);
extern Selectivity estimate_hash_bucketsize(Query *root, Node *hashkey,
int nbuckets);
extern Datum btcostestimate(PG_FUNCTION_ARGS);
extern Datum rtcostestimate(PG_FUNCTION_ARGS);
extern Datum hashcostestimate(PG_FUNCTION_ARGS);