Github user liancheng closed the pull request at:
https://github.com/apache/spark/pull/16917
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GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/16917
[SPARK-19529][BRANCH-1.6] Backport PR #16866 to branch-1.6
## What changes were proposed in this pull request?
This PR backports PR #16866 to branch-1.6
## How was this patch tes
