Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1957#issuecomment-216261831
I had a version that was doing this. The problem there is that you don't
know when you can drop column families. For knowing when a column family is
empty you would have to keep a Set of keys for which you have state in memory.
Which somewhat defeats the purpose of the RocksDB backend.
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