Tamas Mate created IMPALA-9722:
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Summary: 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
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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