SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal \'aes-256-ecb\' (alias mode)
    Literal \'test_key________________________\' (alias key)
   ExpressionList (children 2)
    Identifier mode
    Function decrypt (children 1)
     ExpressionList (children 3)
      Identifier mode
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal NULL
        Literal \'Nullable(String)\'
      Identifier key