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Cause planner to make use of average-column-width statistic that is now

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collected by ANALYZE.  Also, add some modest amount of intelligence to
guesses that are used for varlena columns in the absence of any ANALYZE
statistics.  The 'width' reported by EXPLAIN is finally something less
than totally bogus for varlena columns ... and, in consequence, hashjoin
estimating should be a little better ...
This commit is contained in:
Tom Lane
2001-05-09 00:35:09 +00:00
parent b66a0cca57
commit 6cda3ad8fe
4 changed files with 124 additions and 42 deletions
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4
src/include/utils/lsyscache.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: lsyscache.h,v 1.31 2001/05/07 00:43:26 tgl Exp $
* $Id: lsyscache.h,v 1.32 2001/05/09 00:35:09 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -39,6 +39,8 @@ extern bool get_typbyval(Oid typid);
extern void get_typlenbyval(Oid typid, int16 *typlen, bool *typbyval);
extern char get_typstorage(Oid typid);
extern Datum get_typdefault(Oid typid);
extern int32 get_typavgwidth(Oid typid, int32 typmod);
extern int32 get_attavgwidth(Oid relid, AttrNumber attnum);
extern bool get_attstatsslot(HeapTuple statstuple,
Oid atttype, int32 atttypmod,
int reqkind, Oid reqop,