Currently, sql-block-rule can only be used for query statements, while it's useful for other stmts like insert / delete / alter / drop etc. Now remove the limitation and expand its using scenario.
Some problems have been found with the setting of parallel_fragment_exec_inistance_num > 1.
Try to use this way to set a random parallel_fragment_exec_inistance_num value for each query to cover more situations.
