[jira] [Assigned] (SPARK-30869) Convert dates to/from timestamps in microseconds precision

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-30869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan reassigned SPARK-30869:
-----------------------------------

    Assignee: Maxim Gekk

> 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
>            Assignee: Maxim Gekk
>            Priority: Minor
>
> 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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