Maxim Gekk created SPARK-31579:
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Summary: Replace floorDiv by / in
localRebaseGregorianToJulianDays()
Key: SPARK-31579
URL: https://issues.apache.org/jira/browse/SPARK-31579
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.0
Reporter: Maxim Gekk
Most likely utcCal.getTimeInMillis % MILLIS_PER_DAY == 0 but need to check that
for all available time zones in the range of [0001, 2100] years with the step
of 1 hour or maybe smaller. If this hypothesis is confirmed, floorDiv can be
replaced by /, and this should improve performance of
RebaseDateTime.localRebaseGregorianToJulianDays.
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