Github user 10110346 commented on a diff in the pull request:
https://github.com/apache/spark/pull/17997#discussion_r116888479
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -601,22 +601,32 @@ object DateTimeUtils {
* The calculation uses the fact that the period 1.1.2001 until
31.12.2400 is
* equals to the period 1.1.1601 until 31.12.2000.
*/
- private[this] def getYearAndDayInYear(daysSince1970: SQLDate): (Int,
Int) = {
- // add the difference (in days) between 1.1.1970 and the artificial
year 0 (-17999)
- val daysNormalized = daysSince1970 + toYearZero
- val numOfQuarterCenturies = daysNormalized / daysIn400Years
- val daysInThis400 = daysNormalized % daysIn400Years + 1
- val (years, dayInYear) = numYears(daysInThis400)
- val year: Int = (2001 - 20000) + 400 * numOfQuarterCenturies + years
- (year, dayInYear)
+ private[this] def getYearAndDayInYear(daysSince1970: SQLDate): (Int,
Int, Int) = {
+ val date = new Date(daysToMillis(daysSince1970))
+ val YMD = date.toString.trim.split("-")
--- End diff --
yes,this cause performance worse than before
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