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https://issues.apache.org/jira/browse/SPARK-29328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-29328:
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Affects Version/s: 2.3.4
> Incorrect calculation mean seconds per month
> --------------------------------------------
>
> Key: SPARK-29328
> URL: https://issues.apache.org/jira/browse/SPARK-29328
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.4
> Reporter: Maxim Gekk
> Priority: Minor
>
> Existing implementation assumes 31 days per month or 372 days per year which
> is far away from the correct number. Spark uses the proleptic Gregorian
> calendar by default SPARK-26651 in which the average year is 365.2425 days
> long: https://en.wikipedia.org/wiki/Gregorian_calendar . Need to fix
> calculation in 3 places at least:
> - GroupStateImpl.scala:167: val millisPerMonth =
> TimeUnit.MICROSECONDS.toMillis(CalendarInterval.MICROS_PER_DAY) * 31
> - EventTimeWatermark.scala:32: val millisPerMonth =
> TimeUnit.MICROSECONDS.toMillis(CalendarInterval.MICROS_PER_DAY) * 31
> - DateTimeUtils.scala:610: val secondsInMonth = DAYS.toSeconds(31)
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