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Fix for bug #54459: Assertion failed: param.sort_length,

Browse Source 
file .\filesort.cc, line 149 (part II)

Problem: the server didn't disregard sort order 
for some zero length tuples.

Fix: skip sort order in such a case 
(zero length NOT NULL string functions).
This commit is contained in:
Ramil Kalimullin
2010-06-24 12:00:48 +04:00
parent f48306344a
commit e233dc2bfd
3 changed files with 43 additions and 5 deletions
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15
mysql-test/t/select.test
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@@ -4077,4 +4077,19 @@ SELECT * FROM t1 WHERE 102 < c;
DROP TABLE t1;
--echo #
--echo # Bug #54459: Assertion failed: param.sort_length,
--echo # file .\filesort.cc, line 149 (part II)
--echo #
CREATE TABLE t1(a ENUM('') NOT NULL);
INSERT INTO t1 VALUES (), (), ();
EXPLAIN SELECT 1 FROM t1 ORDER BY a COLLATE latin1_german2_ci;
SELECT 1 FROM t1 ORDER BY a COLLATE latin1_german2_ci;
DROP TABLE t1;
create table t1(a enum('a'))engine=myisam charset=latin1;
insert into t1 values (''),(''),(''),(NULL);
select a, substr(a, 0, 0) from t1 order by substr(a, 0, 0);
select a, a collate latin1_german2_ci from t1 order by a collate latin1_german2_ci;
--echo End of 5.1 tests