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Range optimizer fix:

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If cost(full_scan_on_shortest_covering_index) < cost(best_range_scan) <  cost(full_table_scan)
  use full_scan_on_shortest_covering_index
(before this fix best_range_scan was used)
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unknown
2004-06-22 04:47:28 +04:00
parent 6c50d995c1
commit b482176b6d
14 changed files with 36 additions and 36 deletions
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6
mysql-test/r/range.result
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@ -244,10 +244,10 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 range x x 5 NULL 2 Using where
explain select count(*) from t1 where x in (1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range x x 5 NULL 1 Using where; Using index
1 SIMPLE t1 index x x 5 NULL 9 Using where; Using index
explain select count(*) from t1 where x in (1,2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range x x 5 NULL 2 Using where; Using index
1 SIMPLE t1 index x x 5 NULL 9 Using where; Using index
drop table t1;
CREATE TABLE t1 (key1 int(11) NOT NULL default '0', KEY i1 (key1));
INSERT INTO t1 VALUES (0),(0),(1),(1);
@ -255,7 +255,7 @@ CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya));
INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref j1 j1 4 const 1 Using where; Using index
1 SIMPLE t2 ref j1 j1 4 const 1 Using index
1 SIMPLE t1 ALL i1 NULL NULL NULL 4 Range checked for each record (index map: 0x1)
DROP TABLE t1,t2;
CREATE TABLE t1 (