[jira] [Updated] (FLINK-28736) Add APPROX_PERCENTILE function

["Martijn Visser (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-28736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martijn Visser updated FLINK-28736:
-----------------------------------
    Component/s: Table SQL / API

> 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



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