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Questions about tdigest* KQL functions

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Questions about tdigest* KQL functions

Kyle Burney 20 Reputation points
2024-07-19T18:15:45.0766667+00:00

In the documentation for the tdigest function, it shows sample outputs in the following format but doesn't describe what each nested array represents.

[[n],[a,b,c],[d,e,f]]

It appears the second array is every unique value from the input and the third array is the number of occurrences for them. Is that correct and what does the first array represent?

Also, since this function is returning a digest containing every sample value without any centroid compression or calculating/returning trimmed means, it doesn't seem to be a true t-digest implementation leading to increased query times. Are there plans to optimize this?

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