SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Subquery (alias interval) (children 1)
     SelectWithUnionQuery (children 1)
      ExpressionList (children 1)
       SelectQuery (children 1)
        ExpressionList (children 1)
         Function toIntervalMonth (children 1)
          ExpressionList (children 1)
           Literal UInt64_5
    Function plus (alias res) (children 1)
     ExpressionList (children 2)
      Function toDateTime (children 1)
       ExpressionList (children 1)
        Literal \'2017-01-01 00:00:00\'
      Identifier interval
