Github user ifilonenko commented on the issue: https://github.com/apache/spark/pull/22722 @huafengw Right now I am testing and further developing the experimental design (Option No. 5) that was proposed in https://issues.apache.org/jira/browse/SPARK-25299, building off of the work done by @mccheah. This is targetted for 3.0. I will throw up a WIP soon, which I would love your input on, once we convince the community on the design proposed in the WIP.
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