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Fix for BUG#10037

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* Add 0.01 to cost of 'range'+'using index' scan to avoid optimizer choice races with 
  'index' scan.


mysql-test/r/range.result:
  Update the test result after the changed cost
sql/opt_range.cc:
  Fix for BUG#10037
  * Add 0.01 to cost of 'range'+'using index' scan to avoid optimizer choice races with 
    'index' scan.
  * make QUICK_GROUP_MIN_MAX_SELECT handle the case where the source table is empty.
This commit is contained in:
unknown
2005-04-21 01:55:33 +04:00
parent 241bedadeb
commit a52359e00c
2 changed files with 6 additions and 3 deletions
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4
mysql-test/r/range.result
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@ -256,12 +256,12 @@ 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 index
1 SIMPLE t1 range i1 i1 4 NULL 7 Using where; Using index
1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index
explain select * from t1 force index(i1), t2 force index(j1) 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 index
1 SIMPLE t1 range i1 i1 4 NULL 7 Using where; Using index
1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index
DROP TABLE t1,t2;
CREATE TABLE t1 (
a int(11) default NULL,