Yun Tang created FLINK-16782:

             Summary: Avoid unnecessary check on expired time state when we set 
visibility as ReturnExpiredIfNotCleanedUp
                 Key: FLINK-16782
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / State Backends
    Affects Versions: 1.10.0
            Reporter: Yun Tang
             Fix For: 1.11.0

Current implementation of getting unexpired value would always check whether 
this ttl value is expired first:
// code placeholder
<V> V getUnexpired(TtlValue<V> ttlValue) {
        return ttlValue == null || (expired(ttlValue) && !returnExpired) ? null 
: ttlValue.getUserValue();
However, this check could be avoided if we set return expired time, we could 
improve the performance by check whether to \{{returnExpired}} first.

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