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Bug #42778: delete order by null global variable causes

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assertion .\filesort.cc, line 797

A query with the "ORDER BY @@some_system_variable" clause,
where @@some_system_variable is NULL, causes assertion
failure in the filesort procedures.

The reason of the failure is in the value of
Item_func_get_system_var::maybe_null: it was unconditionally
set to false even if the value of a variable was NULL.
This commit is contained in:
Gleb Shchepa
2009-05-22 01:22:46 +05:00
parent 019e8a6c71
commit 387a54fbbd
14 changed files with 115 additions and 65 deletions
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19
mysql-test/t/variables.test
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@ -1201,4 +1201,23 @@ SET GLOBAL server_id = -1;
SELECT @@GLOBAL.server_id;
SET GLOBAL server_id = @old_server_id;
#
# Bug #42778: delete order by null global variable causes
# assertion .\filesort.cc, line 797
#
SELECT @@GLOBAL.INIT_FILE, @@GLOBAL.INIT_FILE IS NULL;
SELECT @@GLOBAL.REPORT_HOST, @@GLOBAL.REPORT_HOST IS NULL;
SELECT @@GLOBAL.REPORT_PASSWORD, @@GLOBAL.REPORT_PASSWORD IS NULL;
SELECT @@GLOBAL.REPORT_USER, @@GLOBAL.REPORT_USER IS NULL;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES ();
SET @bug42778= @@sql_safe_updates;
SET @@sql_safe_updates= 0;
DELETE FROM t1 ORDER BY (@@GLOBAL.INIT_FILE) ASC LIMIT 10;
SET @@sql_safe_updates= @bug42778;
DROP TABLE t1;
--echo End of 5.1 tests