z1q1q7 commented on issue #7877: Scan return non-exist data from peon
URL: 
https://github.com/apache/incubator-druid/issues/7877#issuecomment-501959644
 
 
   I dump rows with **dump-segment** tools, and found that same <timestamp, 
dimensions> have different effective metrics(in my scene, different metrics 
will push at different time) in different persist files. So I guess query had 
not merge the result(missing metrics were filled with zero). 

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