SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function mapApply (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 x
          Function plus (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal UInt64_1
      Function materialize (children 1)
       ExpressionList (children 1)
        Function map (children 1)
         ExpressionList (children 4)
          Literal UInt64_1
          Literal UInt64_0
          Literal UInt64_2
          Literal UInt64_0