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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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10
mysql-test/suite/sys_vars/t/ssl_cipher_basic.test
View File

@@ -27,7 +27,7 @@
# Displaying default value #
####################################################################
SELECT COUNT(@@GLOBAL.ssl_cipher);
--echo 1 Expected
--echo 0 Expected
--echo '#---------------------BS_STVARS_048_02----------------------#'
@@ -40,7 +40,7 @@ SET @@GLOBAL.ssl_cipher=1;
--echo Expected error 'Read only variable'
SELECT COUNT(@@GLOBAL.ssl_cipher);
--echo 1 Expected
--echo 0 Expected
@@ -56,7 +56,7 @@ WHERE VARIABLE_NAME='ssl_cipher';
--echo 1 Expected
SELECT COUNT(@@GLOBAL.ssl_cipher);
--echo 1 Expected
--echo 0 Expected
SELECT COUNT(VARIABLE_VALUE)
FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
@@ -80,7 +80,7 @@ SELECT @@ssl_cipher = @@GLOBAL.ssl_cipher;
################################################################################
SELECT COUNT(@@ssl_cipher);
--echo 1 Expected
--echo 0 Expected
--Error ER_INCORRECT_GLOBAL_LOCAL_VAR
SELECT COUNT(@@local.ssl_cipher);
@@ -91,7 +91,7 @@ SELECT COUNT(@@SESSION.ssl_cipher);
--echo Expected error 'Variable is a GLOBAL variable'
SELECT COUNT(@@GLOBAL.ssl_cipher);
--echo 1 Expected
--echo 0 Expected
--Error ER_BAD_FIELD_ERROR
SELECT ssl_cipher = @@SESSION.ssl_cipher;