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Posted to dev@hive.apache.org by "Prasanth J (JIRA)" <ji...@apache.org> on 2013/11/19 04:45:24 UTC

[jira] [Created] (HIVE-5849) Improve the stats of operators based on heuristics in the absence of any column statistics

Prasanth J created HIVE-5849:
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             Summary: Improve the stats of operators based on heuristics in the absence of any column statistics
                 Key: HIVE-5849
                 URL: https://issues.apache.org/jira/browse/HIVE-5849
             Project: Hive
          Issue Type: Sub-task
            Reporter: Prasanth J
            Assignee: Prasanth J


In the absence of any column statistics, operators will simply use the statistics from its parents. It is useful to apply some heuristics to update basic statistics (number of rows and data size) in the absence of any column statistics. This will be worst case scenario.



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