Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/3142
Ok, let's not introduce the (now deprecated) default values in the
queryable state API.
I'll create a new Jira and PR for removing that part from the RocksDB
back-end and consistently return `null` for now (which translates to the
`UnknownKeyOrNamespace` exception).
Later we can decide to return `null` instead, if desired. Although a query
for non-existent state could be considered a failure from the point of the
queryable state API.
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