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Merge of fix for Bug#54444.

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This commit is contained in:
Martin Hansson
2010-08-11 17:55:07 +02:00
parent afd775d9e1 41cfa3e769
commit 2c47236bef
4 changed files with 85 additions and 85 deletions
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41
mysql-test/t/partition_range.test
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@@ -931,3 +931,44 @@ insert into t2 values(52, 20070322, 456, 'filler') ;
select sum(count) from t2 ch where ch.defid in (50,52) and ch.day between 20070320 and 20070401 group by defid;
drop table t1, t2;
--echo #
--echo # Bug#50939: Loose Index Scan unduly relies on engine to remember range
--echo # endpoints
--echo #
CREATE TABLE t1 (
a INT,
b INT,
KEY ( a, b )
) PARTITION BY HASH (a) PARTITIONS 1;
CREATE TABLE t2 (
a INT,
b INT,
KEY ( a, b )
);
INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5);
INSERT INTO t1 SELECT a + 5, b + 5 FROM t1;
INSERT INTO t1 SELECT a + 10, b + 10 FROM t1;
INSERT INTO t1 SELECT a + 20, b + 20 FROM t1;
INSERT INTO t1 SELECT a + 40, b + 40 FROM t1;
INSERT INTO t2 SELECT * FROM t1;
--echo # plans should be identical
EXPLAIN SELECT a, MAX(b) FROM t1 WHERE a IN (10,100) GROUP BY a;
EXPLAIN SELECT a, MAX(b) FROM t2 WHERE a IN (10,100) GROUP BY a;
FLUSH status;
SELECT a, MAX(b) FROM t1 WHERE a IN (10, 100) GROUP BY a;
--echo # Should be no more than 4 reads.
SHOW status LIKE 'handler_read_key';
FLUSH status;
SELECT a, MAX(b) FROM t2 WHERE a IN (10, 100) GROUP BY a;
--echo # Should be no more than 4 reads.
SHOW status LIKE 'handler_read_key';
DROP TABLE t1, t2;