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https://issues.apache.org/jira/browse/CASSANDRA-14956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16757569#comment-16757569
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Joseph Lynch commented on CASSANDRA-14956:
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[~beobal] I think that the merge up to trunk broke trunk test runs (e.g. 
[7d138e20|https://circleci.com/gh/jolynch/cassandra/415]). I think it has to do 
with re-using the data directory from {{cassandra-murmur.yaml}}, debugging it 
now but do you think we need a separate ticket for fixing that test or I can 
just submit a fixup patch here?

> Paged Range Slice queries with DISTINCT can drop rows from results
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-14956
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14956
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL/Interpreter
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Major
>             Fix For: 2.1.21, 2.2.14
>
>
> If we have a partition where the first CQL row is fully deleted (possibly via 
> TTLs), and that partition happens to fall on the page boundary of a paged 
> range query which is using SELECT DISTINCT, the next live partition *after* 
> it is omitted from the result set. This is due to over fetching of the pages 
> and a bug in trimming those pages where overlap occurs.
> This does not affect 3.0+.



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