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--source include/have_statement_timeout.inc --echo # Displaying default value SELECT COUNT(@@GLOBAL.have_statement_timeout); --echo 1 Expected --echo # Check if Value can set --error ER_INCORRECT_GLOBAL_LOCAL_VAR SET @@GLOBAL.have_statement_timeout=1; --echo Expected error 'Read only variable' SELECT COUNT(@@GLOBAL.have_statement_timeout); --echo 1 Expected --echo # Check if the value in GLOBAL Table matches value in variable --disable_warnings SELECT @@GLOBAL.have_statement_timeout = VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='have_statement_timeout'; --enable_warnings --echo 1 Expected SELECT COUNT(@@GLOBAL.have_statement_timeout); --echo 1 Expected --disable_warnings SELECT COUNT(VARIABLE_VALUE) FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME='have_statement_timeout'; --enable_warnings --echo 1 Expected --echo # Check if accessing variable with and without GLOBAL point to same variable SELECT @@have_statement_timeout = @@GLOBAL.have_statement_timeout; --echo 1 Expected --echo # Check if have_statement_timeout can be accessed with and without @@ sign SELECT COUNT(@@have_statement_timeout); --echo 1 Expected --error ER_INCORRECT_GLOBAL_LOCAL_VAR SELECT COUNT(@@local.have_statement_timeout); --echo Expected error 'Variable is a GLOBAL variable' --error ER_INCORRECT_GLOBAL_LOCAL_VAR SELECT COUNT(@@SESSION.have_statement_timeout); --echo Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@GLOBAL.have_statement_timeout); --echo 1 Expected --error ER_BAD_FIELD_ERROR SELECT have_statement_timeout = @@SESSION.have_statement_timeout; --echo Expected error 'Readonly variable'