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https://issues.apache.org/jira/browse/PHOENIX-4594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609807#comment-16609807
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Bin Shi commented on PHOENIX-4594:
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Just noticed and realized the work HBASE-12790. I'm reading the Jira and 
evaluate whether it is good enough for read parallelization without multi-tiers 
parallelization supporting.

> Perform binary search on guideposts during query compilation
> ------------------------------------------------------------
>
>                 Key: PHOENIX-4594
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4594
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Assignee: Abhishek Singh Chouhan
>            Priority: Major
>
> If there are many guideposts, performance will suffer during query 
> compilation because we do a linear search of the guideposts to find the 
> intersection with the scan ranges. Instead, in 
> BaseResultIterators.getParallelScans() we should populate an array of 
> guideposts and perform a binary search. 



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