Github user hhbyyh commented on the issue: https://github.com/apache/spark/pull/19599 Many thanks for the review @smurakozi and @attilapiros. > The PR is not complete (did not convert all Param[String] instances to StringParam consistently) so it should be marked as WIP. StringParam is compatible with existing Param[String] so we don't need to update all the Param[String] together. Usually I would wait for some time to confirm the change will not bring any potential issue. After that, we can try to apply it to a wider range. And I really don't want to update all the instances of Param[String] before we agree what's the best practice for some implementation details.
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