SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 4)
    Literal Tuple_(UInt64_1, UInt64_2) (alias x)
    Literal Tuple_(Tuple_(UInt64_1, UInt64_2), Tuple_(UInt64_3, UInt64_4)) (alias y)
    Function in (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Identifier x
    Function in (children 1)
     ExpressionList (children 2)
      Identifier x
      Identifier y