Github user SaintBacchus commented on the pull request:
https://github.com/apache/spark/pull/7239#issuecomment-119120336
> add a `filter` before `take`
It's a better idea @tianyi.
I had modified the implement:
1. If there are hundreds of connections, we keep they in memory
2. When each session finished, we trigger `trimSessionIfNecessary` to
remove the finished sessions and keep the list size below `retainedStatements`
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