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https://issues.apache.org/jira/browse/HBASE-10992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-10992.
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Resolution: Incomplete
> getRowNum of coprocessor may return error count when users set qualifiers
> -------------------------------------------------------------------------
>
> Key: HBASE-10992
> URL: https://issues.apache.org/jira/browse/HBASE-10992
> Project: HBase
> Issue Type: Bug
> Components: Coprocessors
> Affects Versions: 0.94.18
> Reporter: Jianwei Cui
> Priority: Minor
>
> We find getRowNum(...) of AggregateImplementation may return error count when
> users set qualifiers to the parameter scan. The reason might be the following
> code in AggregateImplementation#getRowNum:
> {code}
> byte[] colFamily = scan.getFamilies()[0];
> byte[] qualifier = scan.getFamilyMap().get(colFamily).pollFirst();
> ...
> {code}
> In above code, the method will remove the first user-set qualifier from scan.
> Then, the following scan will return all rows containing data belong to the
> family, which might lead the miscounting. For example, if we put data for
> family='A' and qualifier='a' and count the row by setting family='A' and
> qualifier='b' in scan, we will get unexpected count.
> In my opinion, it is better to only count rows containing the qualifiers of
> family set by user if we allow users to add qualifiers to scan; otherwise,
> it might be better to prevent users from adding qualifiers to scan of
> AggregationClient#rowCount.
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