SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function tuple (alias t) (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal \'1\'
      Literal UInt64_2
    Function tupleElement (children 1)
     ExpressionList (children 2)
      Identifier t
      Literal UInt64_1
    Function tupleElement (children 1)
     ExpressionList (children 2)
      Identifier t
      Literal UInt64_2