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MDEV-4345

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Sampling of selectivity of LIKE predicate.
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unknown
2013-04-18 22:22:04 +03:00
parent 8c71e7a383
commit 9441e53653
16 changed files with 464 additions and 7 deletions
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13
sql/sql_select.h
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@ -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 */