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[GitHub] [spark] xuanyuanking commented on issue #27579: [SPARK-30829][SQL] Define LegacyBehaviorPolicy enumeration as the common value for result change configs

xuanyuanking commented on issue #27579: [SPARK-30829][SQL] Define LegacyBehaviorPolicy enumeration as the common value for result change configs
URL: https://github.com/apache/spark/pull/27579#issuecomment-586185277
 
 
   cc @viirya @dongjoon-hyun @cloud-fan 
   After further thinking, it's strange in #27454 to use `Option[Boolean]` to present a three-value config, especially we have other similar works in the future(e.g. #27537)
   In this PR, I propose `LegacyBehaviorPolicy` as the common config value for these similar issues. Please take a look. Thanks.

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