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https://issues.apache.org/jira/browse/CASSANDRA-14956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16759793#comment-16759793
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Sam Tunnicliffe commented on CASSANDRA-14956:
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Thanks [~jolynch], good catch. I've pushed your fix to trunk in
{{27b35799a46dd5b649c4a172f4f8316b48615304}}
> 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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