Github user sihuazhou commented on the issue:
https://github.com/apache/flink/pull/6020
@StefanRRichter I had a look at the implementation of the iterators in
RocksDB, I found status just return the flag first `_status` as the result
without any complex computation, But for some `composite Iterator` like the
`MergeIteraor` and `TwoLevelIterator` it need to check all the
`InternalIterator` they hold to decide the final status, and I also found the
iterator could be reset to `OK` in some cases...Hmm...do you think this is
super cheap or not?
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