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| author | unknown <monty@hundin.mysql.fi> | 2002-05-17 16:45:00 +0300 |
|---|---|---|
| committer | unknown <monty@hundin.mysql.fi> | 2002-05-17 16:45:00 +0300 |
| commit | 387e77d104887d45a4574a9bd1b826cfa20f01c1 (patch) | |
| tree | 138e0662f05b06e5000a3e7e6fa8383eea492a3b /sql/unireg.h | |
| parent | 66f426c0635d16f7f594f6bf867e13e5cba18500 (diff) | |
| download | mariadb-git-387e77d104887d45a4574a9bd1b826cfa20f01c1.tar.gz | |
Optimize LIKE with turbo-boyer-more algoritm
Docs/manual.texi:
Added info about LIKE optimization
mysql-test/r/func_like.result:
Test of new LIKE optimization
mysql-test/t/func_like.test:
Test of new LIKE optimization
Diffstat (limited to 'sql/unireg.h')
| -rw-r--r-- | sql/unireg.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sql/unireg.h b/sql/unireg.h index c4d2052d1da..5a61f4a6c12 100644 --- a/sql/unireg.h +++ b/sql/unireg.h @@ -122,6 +122,13 @@ bfill((A)->null_flags,(A)->null_bytes,255);\ #define TE_INFO_LENGTH 3 #define MTYP_NOEMPTY_BIT 128 +/* + * Minimum length pattern before Turbo Boyer-Moore is used + * for SELECT "text" LIKE "%pattern%", excluding the two + * wildcards in class Item_func_like. + */ +#define MIN_TURBOBM_PATTERN_LEN 3 + /* Include prototypes for unireg */ #include "mysqld_error.h" |