diff options
Diffstat (limited to 'sql/opt_range.h')
| -rw-r--r-- | sql/opt_range.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sql/opt_range.h b/sql/opt_range.h index d98bf1186e8..963551cabdb 100644 --- a/sql/opt_range.h +++ b/sql/opt_range.h @@ -1051,4 +1051,11 @@ void store_key_image_to_rec(Field *field, uchar *ptr, uint len); extern String null_string; +/* check this number of rows (default value) */ +#define SELECTIVITY_SAMPLING_LIMIT 5000 +/* but no more then this part of table (10%) */ +#define SELECTIVITY_SAMPLING_SHARE 0.10 +/* do not check if we are going check less then this number of records */ +#define SELECTIVITY_SAMPLING_THRESHOLD 10 + #endif |