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https://issues.apache.org/jira/browse/IMPALA-8956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932972#comment-16932972
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Peter Ebert commented on IMPALA-8956:
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May be duplicate of IMPALA-8026
> Row count incorrect in summary while query running
> --------------------------------------------------
>
> Key: IMPALA-8956
> URL: https://issues.apache.org/jira/browse/IMPALA-8956
> Project: IMPALA
> Issue Type: Bug
> Reporter: Peter Ebert
> Priority: Major
> Attachments: image-2019-09-18-20-48-39-069.png,
> image-2019-09-18-21-28-33-720.png
>
>
> For a query (below) the summary is incorrect on the row count for the nested
> loop join, however when the query is complete its corrected:
> select g.name, g.start, g.aa, sum(case when p.pn < 125.0 then 1 else 0 end) /
> cast(max(lf_count) as decimal(10,6)) as lf, sum(case when p.pn >= 125.0 then
> 1 else 0 end) / cast(max(hf_count) as decimal(10,6)) as hff from g join p on
> (g.sampleid = p.sample_id) cross join (select count(*) as lf_count from p
> where pn < 125.0) lff cross join (select count(*) as hf_count from p where pn
> >= 125.0) hf group by g.name, g.start, g.aa order by name desc
>
> !image-2019-09-18-20-48-39-069.png!
> compared to the finished query
> !image-2019-09-18-21-28-33-720.png!
>
>
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