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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2020/04/10 03:34:00 UTC

[jira] [Created] (SPARK-31404) backward compatibility after switching to Proleptic Gregorian calendar

Wenchen Fan created SPARK-31404:
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             Summary: backward compatibility 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


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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