[
https://issues.apache.org/jira/browse/FLINK-28736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18023523#comment-18023523
]
zhisheng commented on FLINK-28736:
----------------------------------
https://issues.apache.org/jira/browse/FLINK-36123
> Add APPROX_PERCENTILE function
> ------------------------------
>
> Key: FLINK-28736
> URL: https://issues.apache.org/jira/browse/FLINK-28736
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Affects Versions: 1.15.1
> Reporter: Josh Mahonin
> Priority: Minor
>
> We have an {{APPROX_PERCENTILE}} UDF that we believe may be useful to the
> broader community. It's a rather simple implementation that wraps TDigest to
> return approximate quantile/percentile data in both batch and streaming mode.
> I'm somewhat torn as to how to properly contribute this. Following Calcite
> conventions, I believe this would qualify as an {{APPROXIMATE
> PERCENTILE_DISC}} function, although that would require Calcite >= 1.28
> (FLINK-21239, FLINK-27998).
> Alternatively, perhaps this could simply be dropped in as a new function
> that's not backed by Calcite, although it's not immediately clear to me how
> to proceed with that, though I'm happy to take guidance here.
> This is a gist of the implementation:
> https://gist.github.com/jmahonin/d75150999af30bc78bdf00c7b0ecbd4f
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
