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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. mysql-test/r/variables.result: Added test case for bug #42778. mysql-test/suite/sys_vars/r/innodb_data_home_dir_basic.result: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/r/innodb_flush_method_basic.result: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/r/rpl_init_slave_func.result: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/r/ssl_capath_basic.result: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/r/ssl_cipher_basic.result: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/t/innodb_data_home_dir_basic.test: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/t/innodb_flush_method_basic.test: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/t/ssl_capath_basic.test: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/suite/sys_vars/t/ssl_cipher_basic.test: Updated test case for bug #42778: system variables were NOT NULL, now they are nullable. mysql-test/t/variables.test: Added test case for bug #42778. sql/item.cc: Bug #42778: delete order by null global variable causes assertion .\filesort.cc, line 797 The longlong_from_string_with_check function has been modified to skip unwanted warnings: now it uses the THD::no_errors flag to suppress warnings. The Item_func_get_system_var::update_null_value method sets the no_error flag. sql/item_func.cc: Bug #42778: delete order by null global variable causes assertion .\filesort.cc, line 797 1. The Item_func_get_system_var::fix_length_and_dec method has been modified to make system variables truly nullable. 2. The Item_func_get_system_var::update_null_value method method has been overloaded with a simple wrapper (like Item_field::update_null_value) to suppress unwanted warnings from Item_func_get_system_var::val_int() calls on non-numeric variable values: the Item_func_get_system_var::update_null_value method sets and restores THD::no_errors flag for a nested call of the longlong_from_string_with_check function. sql/item_func.h: Bug #42778: delete order by null global variable causes assertion .\filesort.cc, line 797 The Item_func_get_system_var::update_null_value method method has been overloaded.
47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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connection slave
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SET @start_max_connections= @@global.max_connections;
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SET @start_init_slave= @@global.init_slave;
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SET @@global.init_slave = 'SET @@global.max_connections = @@global.max_connections + 1';
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DROP TABLE IF EXISTS t1;
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CREATE TEMPORARY TABLE t1 AS SELECT @@global.init_slave AS my_column;
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DESCRIBE t1;
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Field Type Null Key Default Extra
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my_column varchar(59) YES NULL
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DROP TABLE t1;
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SELECT @@global.init_slave = 'SET @@global.max_connections = @@global.max_connections + 1';
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@@global.init_slave = 'SET @@global.max_connections = @@global.max_connections + 1'
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1
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Expect 1
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SELECT @@global.max_connections= @start_max_connections;
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@@global.max_connections= @start_max_connections
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1
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Expect 1
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STOP SLAVE;
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RESET MASTER;
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RESET SLAVE;
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START SLAVE;
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SELECT @@global.max_connections = @start_max_connections + 1;
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@@global.max_connections = @start_max_connections + 1
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1
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Expect 1
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SET @@global.init_slave = "SET @a=5";
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STOP SLAVE;
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RESET MASTER;
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RESET SLAVE;
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START SLAVE;
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SHOW VARIABLES LIKE 'init_slave';
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Variable_name Value
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init_slave SET @a=5
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SELECT @a;
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@a
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NULL
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Expect NULL
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SET @@global.max_connections= @start_max_connections;
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SET @@global.init_slave= @start_init_slave;
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