[GitHub] [incubator-druid] pzhdfy opened a new pull request #8929: [bugfix]fix getAvgSizePerGranularity in DerivativeDataSourceManager(materializedview)

[GitBox <gi...@apache.org>]

pzhdfy opened a new pull request #8929: [bugfix]fix getAvgSizePerGranularity in DerivativeDataSourceManager(materializedview)
URL: https://github.com/apache/incubator-druid/pull/8929
 
 
   ### Description
   
   getAvgSizePerGranularity in DerivativeDataSourceManager is  designed to compute average data size per segment granularity.
   But now it just return the size of a segment.
   After I check the code.
   it uses org.skife.jdbi.v2.Query::first() , other than org.skife.jdbi.v2.Query::list(),
   so it just compute one segment.
   use org.skife.jdbi.v2.Query::list() will do the right things.
   
   
   This PR has:
   - [x] been self-reviewed.
   
   
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