Github user squito commented on the issue:
https://github.com/apache/spark/pull/20090
Thanks for submitting this @liupc. The jira description makes sense,
though I need to take a closer look at the code to confirm things. But at
least two things need to be fixed before this can be merged:
1) can you clean up the PR description?
2) can you add a test case for this?
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