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TODO item done:

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* Change FIXED_CHAR_SEL to 0.20 from 0.04 to give better selectivity (Bruce)
This commit is contained in:
Bruce Momjian
2002-03-08 04:29:01 +00:00
parent fd6b9f04a7
commit ee81126d1f
2 changed files with 4 additions and 5 deletions
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4
src/backend/utils/adt/selfuncs.c
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@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.105 2002/03/02 21:39:32 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/selfuncs.c,v 1.106 2002/03/08 04:29:01 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -2964,7 +2964,7 @@ prefix_selectivity(Query *root, Var *var, char *prefix)
* wildcards (such as % for LIKE or .* for regex) increase it.
*/
#define FIXED_CHAR_SEL 0.04 /* about 1/25 */
#define FIXED_CHAR_SEL 0.20 /* about 1/5 */
#define CHAR_RANGE_SEL 0.25
#define ANY_CHAR_SEL 0.9 /* not 1, since it won't match
* end-of-string */