Jackie-Jiang commented on issue #7264:
URL: https://github.com/apache/pinot/issues/7264#issuecomment-900008623


   @amrishlal Partial and approximation are different, where approximation 
usually gives bounded error rate. The cases we want to notify the user here is 
when some segments are not available (e.g. all replica down), or some servers 
fail to respond (e.g. timeout). We will still return the response, but put some 
message in the query response so that user knows the result is not complete.
   I don't see how this kind of problem is different from exceptions though. If 
some segments throw exception on a given query, we can also treat it as partial 
because it is essentially the same as all replicas down for these segments. 
User can choose to ignore the exceptions and use whatever returned in the 
response.


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