MaxGekk commented on a change in pull request #27491: [SPARK-30754][SQL] Reuse 
results of floorDiv in calculations of floorMod in DateTimeUtils
URL: https://github.com/apache/spark/pull/27491#discussion_r376890351
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
 ##########
 @@ -691,11 +691,11 @@ object DateTimeUtils {
   def truncDate(d: SQLDate, level: Int): SQLDate = {
     def truncToYearLevel(divider: Int, adjust: Int): SQLDate = {
       val oldYear = getYear(d)
-      var newYear = Math.floorDiv(oldYear, divider)
-      if (adjust > 0 && Math.floorMod(oldYear, divider) == 0) {
-        newYear -= 1
+      var newYear = Math.floorDiv(oldYear, divider) * divider
 
 Review comment:
   `oldYear` can be negative, have a look at tests in 
https://github.com/apache/spark/pull/25230, for instance.

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