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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/null_key.result
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@ -30,13 +30,13 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,b a 5 const 3 Using where; Using index
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,b a 9 NULL 2 Using where; Using index
1 SIMPLE t1 ref a,b a 5 const 2 Using where; Using index
explain select * from t1 where a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 Using where; Using index
1 SIMPLE t1 index a a 9 NULL 12 Using where; Using index
explain select * from t1 where a > 8 and a < 9;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 1 Using where; Using index
1 SIMPLE t1 index a a 9 NULL 12 Using where; Using index
select * from t1 where a is null;
a b
NULL 7