[GitHub] [druid] abhishekagarwal87 commented on issue #10154: NPE from CompactionTask

["abhishekagarwal87 (via GitHub)" <gi...@apache.org>]

abhishekagarwal87 commented on issue #10154:
URL: https://github.com/apache/druid/issues/10154#issuecomment-1566951354

   It means that compaction cannot determine what aggregator factory to use for this metric column. One segment has the metric rolled up as max and one segment has that metric rolled up as sum. How would you rollup the metric in these two segments into one? Max or sum? What you can do is provide `metricsSpec` explicitly in your compaction spec. So you tell druid how the two values should be rolled up. 


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