The SHOW HINT STATUS syntax is used to query hint settings for current connection.
ShowHintStatus ::=
  'SHOW' ('SHARDING'|'READWRITE_SPLITTING') 'HINT' 'STATUS'
SHARDING/READWRITE_SPLITTING is not specified, the default is clear all hint settings.SHOW SHARDING HINT STATUS;
SHOW READWRITE_SPLITTING HINT STATUS;
SHOW, SHARDING, READWRITE_SPLITTING, HINT, STATUS
