SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Literal \'aes-256-gcm\' (alias mode)
    Literal \'test_key________________________\' (alias key)
    Literal \'test_iv_____\' (alias iv)
   ExpressionList (children 2)
    Identifier mode
    Function hex (children 1)
     ExpressionList (children 1)
      Function encrypt (children 1)
       ExpressionList (children 4)
        Identifier mode
        Function toNullable (children 1)
         ExpressionList (children 1)
          Literal \'Hello World!\'
        Identifier key
        Identifier iv