[GitHub] [incubator-pinot] pradeepgv42 edited a comment on pull request #5661: Optimize selection order-by when not all selected expressions are ordered

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pradeepgv42 edited a comment on pull request #5661:
URL: https://github.com/apache/incubator-pinot/pull/5661#issuecomment-655838063


   select * from tablename order by timestampCol desc limit 10
   
   Much better than previously but still taking ~30sec. 
   For example, this query is still scanning over 20% of the total rows, is 
there a way to avoid that? 
   
       "numServersQueried": 2,
       "numServersResponded": 2,
       "numSegmentsQueried": 546,
       "numSegmentsProcessed": 538,
       "numSegmentsMatched": 538,
       "numConsumingSegmentsQueried": 8,
       "numDocsScanned": 891433991,
       "numEntriesScannedInFilter": 0,
       "numEntriesScannedPostFilter": 1783093942,
       "numGroupsLimitReached": false,
       "totalDocs": 891433991,
       "timeUsedMs": 26382,
       "segmentStatistics": [],
       "traceInfo": {},
       "minConsumingFreshnessTimeMs": 9223372036854775807


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