SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function plus (alias x) (children 1)
     ExpressionList (children 2)
      Function toDateTime (children 1)
       ExpressionList (children 1)
        Literal \'2017-01-01 00:00:00\'
      Function toIntervalMonth (children 1)
       ExpressionList (children 1)
        Literal UInt64_0