SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function array (alias arr1) (children 1)
     ExpressionList (children 1)
      Literal Tuple_(UInt64_1, UInt64_2)
    Function array (alias arr2) (children 1)
     ExpressionList (children 1)
      Literal Tuple_(UInt64_3, UInt64_4)
   ExpressionList (children 1)
    Function arrayMap (children 1)
     ExpressionList (children 3)
      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)
          Function tupleElement (children 1)
           ExpressionList (children 2)
            Identifier y
            Literal UInt64_1
          Function tupleElement (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal UInt64_2
      Identifier arr1
      Identifier arr2
