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Bug #42778: delete order by null global variable causes

Browse Source 
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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20
mysql-test/suite/sys_vars/r/innodb_flush_method_basic.result
View File

@ -1,16 +1,16 @@
'#---------------------BS_STVARS_029_01----------------------#'
SELECT COUNT(@@GLOBAL.innodb_flush_method);
COUNT(@@GLOBAL.innodb_flush_method)
1
1 Expected
0
0 Expected
'#---------------------BS_STVARS_029_02----------------------#'
SET @@GLOBAL.innodb_flush_method=1;
ERROR HY000: Variable 'innodb_flush_method' is a read only variable
Expected error 'Read only variable'
SELECT COUNT(@@GLOBAL.innodb_flush_method);
COUNT(@@GLOBAL.innodb_flush_method)
1
1 Expected
0
0 Expected
'#---------------------BS_STVARS_029_03----------------------#'
SELECT @@GLOBAL.innodb_flush_method = VARIABLE_VALUE
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
@ -20,8 +20,8 @@ NULL
1 Expected
SELECT COUNT(@@GLOBAL.innodb_flush_method);
COUNT(@@GLOBAL.innodb_flush_method)
1
1 Expected
0
0 Expected
SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
WHERE VARIABLE_NAME='innodb_flush_method';
@ -36,8 +36,8 @@ NULL
'#---------------------BS_STVARS_029_05----------------------#'
SELECT COUNT(@@innodb_flush_method);
COUNT(@@innodb_flush_method)
1
1 Expected
0
0 Expected
SELECT COUNT(@@local.innodb_flush_method);
ERROR HY000: Variable 'innodb_flush_method' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
@ -46,8 +46,8 @@ ERROR HY000: Variable 'innodb_flush_method' is a GLOBAL variable
Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@GLOBAL.innodb_flush_method);
COUNT(@@GLOBAL.innodb_flush_method)
1
1 Expected
0
0 Expected
SELECT innodb_flush_method = @@SESSION.innodb_flush_method;
ERROR 42S22: Unknown column 'innodb_flush_method' in 'field list'
Expected error 'Readonly variable'