SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function array (alias arr1) (children 1)
     ExpressionList (children 1)
      Literal Tuple_(UInt64_1, UInt64_2)
   ExpressionList (children 1)
    Function arrayMap (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier x
          Identifier y
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier y
          Identifier x
      Identifier arr1
