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https://issues.apache.org/jira/browse/HBASE-5821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhihong Ted Yu updated HBASE-5821:
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Resolution: Fixed
Status: Resolved (was: Patch Available)
> Incorrect handling of null value in Coprocessor aggregation function min()
> --------------------------------------------------------------------------
>
> Key: HBASE-5821
> URL: https://issues.apache.org/jira/browse/HBASE-5821
> Project: HBase
> Issue Type: Bug
> Components: coprocessors
> Affects Versions: 0.92.1
> Reporter: Maryann Xue
> Assignee: Maryann Xue
> Fix For: 0.92.3
>
> Attachments: HBASE-5821.patch
>
>
> Both in AggregateImplementation and AggregationClient, the evaluation of the
> current minimum value is like:
> min = (min == null || ci.compare(result, min) < 0) ? result : min;
> The LongColumnInterpreter takes null value is treated as the least value,
> while the above expression takes min as the greater value when it is null.
> Thus, the real minimum value gets discarded if a null value comes later.
> max() could also be wrong if a different ColumnInterpreter other than
> LongColumnInterpreter treats null value differently (as the greatest).
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