Mikael Brännström created DRILL-8536:
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Summary: 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
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(tdigest, quantile) -> wrapped call to
TDigest.quantile(quantile)
* tdigest_min(tdigest) -> wrapped call to TDigest.min()
* tdigest_max(tdigest) -> wrapped call to TDigest.max()
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