Wenchen Fan created SPARK-24625:
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Summary: 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: 2.4.0
Reporter: Wenchen Fan
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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