Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/18605
@wangmiao1981 This is expected, see my comment
[here](https://github.com/apache/spark/pull/18613#discussion_r127011929) . This
uncovers an existing bug for ```forceIndexLabel```. I will send a fix later,
please use ```keep``` to test ```handleInvalid``` currently. Thanks.
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