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Fix order_by test failure: don't run EXPLAIN for a query that has multiple

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range plans with identical costs.
This commit is contained in:
Sergey Petrunya 2010-07-15 18:07:01 +04:00
parent 11b1949303
commit 4274e9b5d4
2 changed files with 12 additions and 3 deletions
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9
mysql-test/r/order_by.result
View file

@ -607,9 +607,14 @@ FieldKey LongVal StringVal
1 0 2
1 1 3
1 2 1
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
DS-MRR: use two IGNORE INDEX queries, otherwise we get cost races, because
DS-MRR: records_in_range/read_time return the same numbers for all three indexes
EXPLAIN SELECT * FROM t1 IGNORE INDEX (LongField, StringField) WHERE FieldKey > '2' ORDER BY LongVal;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range FieldKey,LongField,StringField FieldKey 38 NULL 4 Using index condition; Using where; Using MRR; Using filesort
1 SIMPLE t1 range FieldKey FieldKey 38 NULL 4 Using index condition; Using MRR; Using filesort
EXPLAIN SELECT * FROM t1 IGNORE INDEX (FieldKey, LongField) WHERE FieldKey > '2' ORDER BY LongVal;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range StringField StringField 38 NULL 4 Using where; Using filesort
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
FieldKey LongVal StringVal
3 1 2

6
mysql-test/t/order_by.test
View file

@ -402,7 +402,11 @@ CREATE TABLE t1 (
INSERT INTO t1 VALUES ('0',3,'0'),('0',2,'1'),('0',1,'2'),('1',2,'1'),('1',1,'3'), ('1',0,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('3',2,'1'),('3',1,'2'),('3','3','3');
EXPLAIN SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
--echo DS-MRR: use two IGNORE INDEX queries, otherwise we get cost races, because
--echo DS-MRR: records_in_range/read_time return the same numbers for all three indexes
EXPLAIN SELECT * FROM t1 IGNORE INDEX (LongField, StringField) WHERE FieldKey > '2' ORDER BY LongVal;
EXPLAIN SELECT * FROM t1 IGNORE INDEX (FieldKey, LongField) WHERE FieldKey > '2' ORDER BY LongVal;
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;