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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