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https://issues.apache.org/jira/browse/DRILL-8536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18019342#comment-18019342
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Charles Givre commented on DRILL-8536:
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[~mbrannstrom] Is it your intention to implement this or is this just a feature
request? If your plan is to implement it, I can assist if you need help with
the Drill internals.
> Add SQL functions tdigest_quantile, tdigest_min, and tdigest_max
> ----------------------------------------------------------------
>
> Key: DRILL-8536
> URL: https://issues.apache.org/jira/browse/DRILL-8536
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Mikael Brännström
> Priority: Major
>
> There are two t-digest (histogram) related SQL functions, to construct and
> merge t-digest data.
> However, there is no way to read any useful information from the t-digest,
> which makes the current two functions "tdigest" and "tdigest_merge" quite
> pointless.
> It is suggested that 3 new SQL functions are added to
> org.apache.drill.exec.expr.fn.impl.TDigestFunctions:
>
> * tdigest_quantile(binary tdigest, double quantile) -> wrapped call to
> TDigest.quantile(quantile)
> * tdigest_min(binary tdigest) -> wrapped call to TDigest.min()
> * tdigest_max(binary tdigest) -> wrapped call to TDigest.max()
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