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https://issues.apache.org/jira/browse/SPARK-31404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-31404:
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Priority: Blocker (was: Major)
> backward compatibility issues after switching to Proleptic Gregorian calendar
> -----------------------------------------------------------------------------
>
> Key: SPARK-31404
> URL: https://issues.apache.org/jira/browse/SPARK-31404
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Wenchen Fan
> Priority: Blocker
>
> In Spark 3.0, we switch to the Proleptic Gregorian calendar by using the Java
> 8 datetime APIs. This makes Spark follow the ISO and SQL standard, but
> introduces some backward compatibility problems:
> 1. may read wrong data from the data files written by Spark 2.4
> 2. may have perf regression
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