Github user tedyu commented on a diff in the pull request: https://github.com/apache/spark/pull/7882#discussion_r36114103 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala --- @@ -614,8 +614,9 @@ object DateTimeUtils { */ def dateAddMonths(days: Int, months: Int): Int = { val absoluteMonth = (getYear(days) - YearZero) * 12 + getMonth(days) - 1 + months - val currentMonthInYear = absoluteMonth % 12 - val currentYear = absoluteMonth / 12 + val nonNegativeMonth = if (absoluteMonth >= 0) absoluteMonth else 0 + val currentMonthInYear = nonNegativeMonth % 12 + val currentYear = nonNegativeMonth / 12 --- End diff -- /% is not defined for Int. I read the notion in a Scala book which I have returned. I will read more once I have that book back.
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