diff options
| author | unknown <sanja@askmonty.org> | 2013-04-18 22:22:04 +0300 |
|---|---|---|
| committer | unknown <sanja@askmonty.org> | 2013-04-18 22:22:04 +0300 |
| commit | 9441e536535af3e71aaa81801645ab42bd07e89f (patch) | |
| tree | 4479a5d77e53380b7bd2d9b3d4db3c271ea6b40a /sql/sql_select.h | |
| parent | 8c71e7a38358c79e1b5b9072fa7407cec3cfd273 (diff) | |
| download | mariadb-git-9441e536535af3e71aaa81801645ab42bd07e89f.tar.gz | |
MDEV-4345
Sampling of selectivity of LIKE predicate.
Diffstat (limited to 'sql/sql_select.h')
| -rw-r--r-- | sql/sql_select.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/sql/sql_select.h b/sql/sql_select.h index 9cda68bd434..950c48d6ea1 100644 --- a/sql/sql_select.h +++ b/sql/sql_select.h @@ -1855,4 +1855,17 @@ void setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps); double prev_record_reads(POSITION *positions, uint idx, table_map found_ref); void fix_list_after_tbl_changes(SELECT_LEX *new_parent, List<TABLE_LIST> *tlist); +struct st_cond_statistic +{ + Item *cond; + Field *field_arg; + ulong positive; +}; +typedef struct st_cond_statistic COND_STATISTIC; + +ulong check_selectivity(THD *thd, + ulong rows_to_read, + TABLE *table, + List<COND_STATISTIC> *conds); + #endif /* SQL_SELECT_INCLUDED */ |