[jira] [Resolved] (SPARK-31630) Skip timestamp rebasing after 1900-01-01

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

     [ https://issues.apache.org/jira/browse/SPARK-31630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-31630.
---------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 28441
[https://github.com/apache/spark/pull/28441]

> Skip timestamp rebasing after 1900-01-01
> ----------------------------------------
>
>                 Key: SPARK-31630
>                 URL: https://issues.apache.org/jira/browse/SPARK-31630
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0, 3.1.0
>            Reporter: Maxim Gekk
>            Assignee: Maxim Gekk
>            Priority: Major
>             Fix For: 3.0.0
>
>
> The conversions of Catalyst's DATE/TIMESTAMPS to/from Java's types java.sql.Date/java.sql.Timestamps have almost the same implementation except addition rebasing op. If we look at switch and diffs arrays of all available time zones, we can detect that there is a time point when all diffs are 0. This is 1900-01-01 00:00:00Z. So, we can compare input micros with the time point and skip conversion for modern timestamps.



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