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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)
This commit is contained in:
sergefp@mysql.com
2004-06-22 04:47:28 +04:00
parent 7a9f4c6a2a
commit f874071a26
14 changed files with 36 additions and 36 deletions
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2
mysql-test/r/heap_btree.result
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@ -66,7 +66,7 @@ a
alter table t1 engine=myisam;
explain select * from t1 where a in (869751,736494,226312,802616);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range uniq_id uniq_id 4 NULL 4 Using where; Using index
1 SIMPLE t1 index uniq_id uniq_id 4 NULL 4 Using where; Using index
drop table t1;
create table t1 (x int not null, y int not null, key x using BTREE (x,y), unique y using BTREE (y))
engine=heap;