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Latest commit da26bdc Jan 17, 2017 @NicoK NicoK committed with rmetzger [FLINK-5613][query] querying a non-existing key is inconsistent among…
… state backends

Querying for a non-existing key for a state that has a default value set
currently results in an UnknownKeyOrNamespace exception when the
MemoryStateBackend or FsStateBackend is used but results in the default value
if RocksDBStateBackend is set.

This removes the special handling from the RocksDBStateBackend and makes it
consistent with the other two back-ends, i.e. returning null which results
in the mentioned UnknownKeyOrNamespace exception.

This closes #3193