Maxim Gekk created SPARK-30869:
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Summary: Convert dates to/from timestamps in microseconds precision
Key: SPARK-30869
URL: https://issues.apache.org/jira/browse/SPARK-30869
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Maxim Gekk
Currently, Spark converts dates to/from "timestamp" in millisecond precision
but internally Catalyst's TimestampType values are stored as microseconds since
epoch. When such conversion is needed in other date-timestamp functions like
DateTimeUtils.monthsBetween, the function has to convert microseconds to
milliseconds and then to days, see
https://github.com/apache/spark/blob/06217cfded8d32962e7c54c315f8e684eb9f0999/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala#L577-L580
which just brings additional overhead w/o any benefits.
In later versions, it makes sense because milliseconds can be passed to
TimeZone.getOffset but recently Spark switched to Java 8 time API and ZoneId.
And supporting conversions to milliseconds are not needed any more.
The ticket aims to replace millisToDays by microsToDays, and daysToMillis by
daysToMicros in DateTimeUtils.
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