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Bug#56862 Execution of a query that uses index merge returns a wrong result

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In case of low memory sort buffer QUICK_INDEX_MERGE_SELECT creates
temporary file where is stores row ids which meet QUICK_SELECT ranges
except of clustered pk range, clustered range is processed separately.
In init_read_record we check if temporary file is used and choose
appropriate record access method. It does not take into account that
temporary file contains partial result in case of QUICK_INDEX_MERGE_SELECT
with clustered pk range.
The fix is always to use rr_quick if QUICK_INDEX_MERGE_SELECT
with clustered pk range is used.


mysql-test/suite/innodb/r/innodb_mysql.result:
  test case
mysql-test/suite/innodb/t/innodb_mysql.test:
  test case
mysql-test/suite/innodb_plugin/r/innodb_mysql.result:
  test case
mysql-test/suite/innodb_plugin/t/innodb_mysql.test:
  test case
sql/opt_range.h:
  added new method
sql/records.cc:
  The fix is always to use rr_quick if QUICK_INDEX_MERGE_SELECT
  with clustered pk range is used.
This commit is contained in:
Sergey Glukhov
2010-11-23 13:18:47 +03:00
parent 412f11418a
commit cf0cc723aa
6 changed files with 175 additions and 0 deletions
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38
mysql-test/suite/innodb_plugin/r/innodb_mysql.result
View File

@ -2400,4 +2400,42 @@ PACK_KEYS=0;
CREATE INDEX a ON t1 (a);
CREATE INDEX c on t1 (c);
DROP TABLE t1;
CREATE TABLE t1 (
pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
a int,
b int,
INDEX idx(a))
ENGINE=INNODB;
INSERT INTO t1(a,b) VALUES
(11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
(3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
(6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
(13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1(a,b) SELECT a,b FROM t1;
INSERT INTO t1 VALUES (1000000, 0, 0);
SET SESSION sort_buffer_size = 1024*36;
EXPLAIN
SELECT COUNT(*) FROM
(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
2 DERIVED t1 index_merge PRIMARY,idx idx,PRIMARY 5,4 NULL 3537 Using sort_union(idx,PRIMARY); Using where
SELECT COUNT(*) FROM
(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
COUNT(*)
1537
SET SESSION sort_buffer_size = DEFAULT;
DROP TABLE t1;
End of 5.1 tests