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https://issues.apache.org/jira/browse/ARROW-12334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17318973#comment-17318973
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Andy Grove commented on ARROW-12334:
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I'm now very confused about this issue. I have been working on debugging it and 
now it suddenly is working, so I don't know if it is an intermittent bug or 
not. When it works correctly, the query returns 4 rows and takes ~13 seconds 
for me. When it does not work it returns many times more rows and takes 3x as 
long.

It would be good to get a second pair of eyes on this.

> [Rust] [Ballista] Aggregate queries producing incorrect results
> ---------------------------------------------------------------
>
>                 Key: ARROW-12334
>                 URL: https://issues.apache.org/jira/browse/ARROW-12334
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Rust - Ballista
>            Reporter: Andy Grove
>            Assignee: Andy Grove
>            Priority: Major
>             Fix For: 4.0.0
>
>
> I just ran benchmarks for the first time in a while and I see duplicate 
> entries for group by keys.
>  
> For example, query 1 has "group by l_returnflag, l_linestatus" and I see 
> multiple results with l_returnflag = 'A' and l_linestatus = 'F'.



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