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## What changes were proposed in this pull request? a followup of https://github.com/apache/spark/pull/23043 . Add a test to show the minor behavior change introduced by #23043 , and add migration guide. ## How was this patch tested? a new test Closes #23141 from cloud-fan/follow. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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