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Posted to dev@phoenix.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2017/10/20 20:57:00 UTC

[jira] [Updated] (PHOENIX-4312) Choose between sort merge and hash join based on size of scanned data

     [ https://issues.apache.org/jira/browse/PHOENIX-4312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Taylor updated PHOENIX-4312:
----------------------------------
    Labels: CostBasedOptimization  (was: )

> Choose between sort merge and hash join based on size of scanned data
> ---------------------------------------------------------------------
>
>                 Key: PHOENIX-4312
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4312
>             Project: Phoenix
>          Issue Type: Test
>            Reporter: James Taylor
>              Labels: CostBasedOptimization
>
> Using stats, we can determine how much data will be scanned. Though not perfect, this often is a pretty accurate picture of how many rows will be joined together. We should drive the determination of the join strategy based on cost.



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