SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   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 plus (children 1)
         ExpressionList (children 2)
          Identifier x
          Identifier y
      Function array (children 1)
       ExpressionList (children 1)
        Function tuple (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Literal UInt64_2
