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https://issues.apache.org/jira/browse/PHOENIX-4807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539046#comment-16539046
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Josh Elser commented on PHOENIX-4807:
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[~sergey.soldatov] was the brains behind getting to the bottom of this one.
> Document query behavior when statistics unavailable for some table regions.
> ---------------------------------------------------------------------------
>
> Key: PHOENIX-4807
> URL: https://issues.apache.org/jira/browse/PHOENIX-4807
> Project: Phoenix
> Issue Type: Task
> Reporter: Guru Prateek Pinnadhari
> Priority: Major
>
> When troubleshooting an issue with retrieval of duplicate records for a
> select query on same PK, the behavior seen was: query plan's collection of
> Scan objects were such that they led to generation of overlapping scans on a
> salted table's regions.
> A contributing factor was statistics being unavailable for the terminal
> regions of the table. Filing Jira to add a note about this on
> [https://phoenix.apache.org/update_statistics.html]
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