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Posted to dev@phoenix.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2017/01/06 23:26:58 UTC

[jira] [Commented] (PHOENIX-153) Implement TABLESAMPLE clause

    [ https://issues.apache.org/jira/browse/PHOENIX-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15806135#comment-15806135 ] 

James Taylor commented on PHOENIX-153:
--------------------------------------

Another potential means of doing sampling (as pointed out by [~lhofhansl]) is when a table is salted. Given that a salt is limited to a single byte, this may not work that well. However, if multiple bytes could be specified (PHOENIX-3574), that would be a good option.

> Implement TABLESAMPLE clause
> ----------------------------
>
>                 Key: PHOENIX-153
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-153
>             Project: Phoenix
>          Issue Type: Task
>            Reporter: James Taylor
>              Labels: enhancement
>
> Support the standard SQL TABLESAMPLE clause by implementing a filter that uses a skip next hint based on the region boundaries of the table to only return n rows per region.



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