HeartSaVioR commented on PR #37026:
URL: https://github.com/apache/spark/pull/37026#issuecomment-1171711978

   The new test utility methods heavily rely on fact the operation should be 
flatMapGroupsWithState whereas it is just a one of many stateful operations. I 
don't see this like a general way to query the state even in test context. In 
reality it should require the operator ID, store name (if the operator 
leverages multiple state stores) "at least". Please refer the implementation of 
stream-stream join how it leverages state store"s".
   
   It would be nice if we have a "general" way to query the state while 
streaming query is running (in general, reading the checkpoint while the query 
is running concurrently is a bad idea). Once we have the feature we can 
leverage the feature to achieve the same.


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