Github user bowenli86 commented on the issue: https://github.com/apache/flink/pull/4963 @yunfan123 sorry I can't find where `PredefinedOptions` defines it. Isn't Flink using RocksDB's `StringAppendTESTOperator` in `RocksDBKeyedStateBackend`? Hi @aljoscha , do you have insightful suggestions?
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