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https://issues.apache.org/jira/browse/SPARK-24625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-24625.
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Fix Version/s: 3.0.0
Resolution: Fixed
> put all the backward compatible behavior change configs under
> spark.sql.legacy.*
> --------------------------------------------------------------------------------
>
> Key: SPARK-24625
> URL: https://issues.apache.org/jira/browse/SPARK-24625
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Wenchen Fan
> Priority: Major
> Fix For: 3.0.0
>
>
> Recently we made several behavior changes to Spark SQL, to make it more ANSI
> SQL compliant or fix some unreasonable behaviors. For backward compatibility,
> we add configs to allow users fallback to the old behavior and plan to remove
> them in Spark 3.0. It's better to put these configs under spark.sql.legacy.*
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