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 decrypt (children 1)
     ExpressionList (children 4)
      Identifier mode
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal NULL
        Literal \'Nullable(String)\'
      Identifier key
      Identifier iv