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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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21
mysql-test/r/variables.result
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@ -1436,7 +1436,7 @@ Warnings:
Warning 1292 Truncated incorrect auto_increment_offset value: '0'
select @@storage_engine;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def @@storage_engine 253 6 6 N 1 31 8
def @@storage_engine 253 6 6 Y 0 31 8
@@storage_engine
MyISAM
SET @old_server_id = @@GLOBAL.server_id;
@ -1467,4 +1467,23 @@ SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
0
SET GLOBAL server_id = @old_server_id;
SELECT @@GLOBAL.INIT_FILE, @@GLOBAL.INIT_FILE IS NULL;
@@GLOBAL.INIT_FILE @@GLOBAL.INIT_FILE IS NULL
NULL 1
SELECT @@GLOBAL.REPORT_HOST, @@GLOBAL.REPORT_HOST IS NULL;
@@GLOBAL.REPORT_HOST @@GLOBAL.REPORT_HOST IS NULL
NULL 1
SELECT @@GLOBAL.REPORT_PASSWORD, @@GLOBAL.REPORT_PASSWORD IS NULL;
@@GLOBAL.REPORT_PASSWORD @@GLOBAL.REPORT_PASSWORD IS NULL
NULL 1
SELECT @@GLOBAL.REPORT_USER, @@GLOBAL.REPORT_USER IS NULL;
@@GLOBAL.REPORT_USER @@GLOBAL.REPORT_USER IS NULL
NULL 1
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;
End of 5.1 tests