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https://issues.apache.org/jira/browse/IMPALA-9722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tamas Mate resolved IMPALA-9722.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Consolidate unused total_width and the way avg_width is computed in
> PerColumnStats
> ----------------------------------------------------------------------------------
>
> Key: IMPALA-9722
> URL: https://issues.apache.org/jira/browse/IMPALA-9722
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Tamas Mate
> Assignee: Tamas Mate
> Priority: Major
> Labels: statistics
> Fix For: Impala 4.0
>
>
> PerColumnStats.total_width is an unused field in
> [incr-stats-util.cc|https://github.com/apache/impala/blob/master/be/src/exec/incr-stats-util.cc#L134]
> while the comment says that it is the result of {{(avg_width * num_rows)}}.
> Later [similar
> multiplication|https://github.com/apache/impala/blob/master/be/src/exec/incr-stats-util.cc#L159]
> can be found in the Update method, however the result is stored in
> {{avg_width}}.
> {code:cpp}
> avg_width += (new_avg_width * num_new_rows);
> {code}
> We should consolidate these fields and the calculations.
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