Jackie-Jiang opened a new issue #7264:
URL: https://github.com/apache/pinot/issues/7264


   There are 3 scenarios when the broker response might be partial:
   1. There are some segments without online server in external view - 
`numUnavailableSegments` in `BaseBrokerRequestHandler` line 718
   2. Some segments are not available on server - `numSegmentsQueried > 
numSegmentsAcquired` in `ServerQueryExecutorV1Impl` line 170
   3. Some servers not responded - `numServersQueried > numServersResponded` in 
`SingleConnectionBrokerRequestHandler` line 128
   
   Currently these partial responses are only tracked by metrics/query stats, 
but not modeled as an exception. We should add an exception to the broker 
response to inform the users that the response might be partial


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