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https://issues.apache.org/jira/browse/HBASE-9543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13800810#comment-13800810
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Ted Yu commented on HBASE-9543:
-------------------------------
Took a quick look at the patch.
This feature is about getting unique values in selected range of rows. Should
the method name be more specific so that the functionality is clearer ?
{code}
+ if (colSet.size() > uniqueNumLimit) {
+ throw new IOException("uniqe column value num is larger than
limit: "
+ + uniqueNumLimit + ", check scan params, or set the conf: "
+ + HConstants.HBASE_AGGREGATION_UNIQUE_MAXSIZE);
{code}
Once the client receives IOException, adjustment has to be made for the next
call. Can we return partial results ?
It would be nice to post the patch on reviews.apache.org
> Impl unique aggregation
> ------------------------
>
> Key: HBASE-9543
> URL: https://issues.apache.org/jira/browse/HBASE-9543
> Project: HBase
> Issue Type: New Feature
> Components: Coprocessors
> Reporter: Liu Shaohui
> Assignee: Liu Shaohui
> Priority: Minor
> Attachments: HBASE-9543-0.94-v1.diff, HBASE-9543-trunk-v1.diff,
> HBASE-9543-trunk-v2.diff, HBASE-9543-trunk-v3.diff, HBASE-9543-trunk-v4.diff
>
>
> Impl unique aggregation: return a set of all columns' values in a scan.
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