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MDEV-415: Back-port of the WL task #1393 from the mysql-5.6 code line.

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The task adds a more efficient handling of the queries with 
ORDER BY order LIMIT n, such that n is small enough and
no indexes are used for order.
This commit is contained in:
Igor Babaev
2012-09-01 14:21:59 -07:00
parent 5a86a61219
commit a6b88f1431
29 changed files with 2600 additions and 221 deletions
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2
mysql-test/r/filesort_debug.result
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@ -4,7 +4,7 @@ SET @old_debug= @@session.debug;
#
CREATE TABLE t1(f0 int auto_increment primary key, f1 int);
INSERT INTO t1(f1) VALUES (0),(1),(2),(3),(4),(5);
SET session debug_dbug= '+d,make_sort_keys_alloc_fail';
SET session debug_dbug= '+d,alloc_sort_buffer_fail';
CALL mtr.add_suppression("Out of sort memory");
SELECT * FROM t1 ORDER BY f1 ASC, f0;
ERROR HY001: Out of sort memory, consider increasing server sort buffer size