Myasuka commented on issue #9255: [FLINK-13034] Introduce isEmpty method for MapState URL: https://github.com/apache/flink/pull/9255#issuecomment-529528358 @carp84 thanks for your review. Actually, I have created [FLINK-13846](https://issues.apache.org/jira/browse/FLINK-13846) to track this. If we want to know the improvement after introducing `isEmpty()` compared to previous solution to use `iterator.hasNext()`, I think I need to use a temp implementation of our micro benchmark.
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