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