Github user tdas closed the pull request at:
https://github.com/apache/spark/pull/16850
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GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/16850
[SPARK-19413][SS] MapGroupsWithState for arbitrary stateful operations
## What changes were proposed in this pull request?
`mapGroupsWithState` is a new API for arbitrary stateful operations
