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Posted to dev@hive.apache.org by "Rui Li (JIRA)" <ji...@apache.org> on 2015/04/08 16:00:31 UTC

[jira] [Created] (HIVE-10261) Data size can be underestimated when computed with partial column stats

Rui Li created HIVE-10261:
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             Summary: Data size can be underestimated when computed with partial column stats
                 Key: HIVE-10261
                 URL: https://issues.apache.org/jira/browse/HIVE-10261
             Project: Hive
          Issue Type: Bug
            Reporter: Rui Li


With {{hive.stats.fetch.column.stats=true}}, we'll estimate data size with column  stats when annotating operators with statistics. However, when column stats is partial, we're likely to underestimate data size, which may hurt performance, e.g. picking an inappropriate small table for map join.



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