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https://issues.apache.org/jira/browse/PHOENIX-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108390#comment-16108390
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James Taylor commented on PHOENIX-153:
--------------------------------------
Seems like review comments aren't appearing here in JIRA (maybe because your
commit message doesn't include the JIRA number in the expected format), so I'll
repeat it here:
Let's move the explain for the sampling into the first line, before we recurse
down for the other steps. You can put it on the same line, after the "-WAY "
like this:
CLIENT PARALLEL 1-WAY 0.48-SAMPLED ...
Otherwise, users will interpret the sampling as happening after the
scan/filtering which isn't the case.
> Implement TABLESAMPLE clause
> ----------------------------
>
> Key: PHOENIX-153
> URL: https://issues.apache.org/jira/browse/PHOENIX-153
> Project: Phoenix
> Issue Type: Task
> Reporter: James Taylor
> Assignee: Ethan Wang
> Labels: enhancement
> Attachments: Sampling_Accuracy_Performance.jpg
>
>
> 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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