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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2020/05/18 05:28:00 UTC
[jira] [Updated] (SPARK-31404) file source backward compatibility
after calendar switch
[ https://issues.apache.org/jira/browse/SPARK-31404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan updated SPARK-31404:
--------------------------------
Attachment: Switch to Java 8 time API in Spark 3.0.pdf
> file source backward compatibility after calendar switch
> --------------------------------------------------------
>
> 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
> Fix For: 3.0.0
>
> Attachments: Switch to Java 8 time API in Spark 3.0.pdf
>
>
> 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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