assertnode1.query("SELECT column_x FROM odbc('DSN={}', '{}') SETTINGS external_table_functions_use_nulls=1".format(mysql_setup["DSN"],table_name))=='\\N\n511\n'
assertnode1.query("SELECT column_x FROM odbc('DSN={}', '{}') SETTINGS external_table_functions_use_nulls=0".format(mysql_setup["DSN"],table_name))=='0\n511\n'
assertnode1.query("SELECT column_x FROM odbc('DSN={}', '{}')".format(mysql_setup["DSN"],table_name),settings={"external_table_functions_use_nulls":"1"})=='\\N\n511\n'
assertnode1.query("SELECT column_x FROM odbc('DSN={}', '{}')".format(mysql_setup["DSN"],table_name),settings={"external_table_functions_use_nulls":"0"})=='0\n511\n'
node1.query('''
CREATE TABLE {}(id UInt32, name String, age UInt32, money UInt32, column_x Nullable(UInt32)) ENGINE = MySQL('mysql1:3306', 'clickhouse', '{}', 'root', 'clickhouse');