min_val(digest TDigest) RETURNS DOUBLE PRECISION
Get the minimum value from a t-digest (does not work with
uddsketch based estimators).
This is provided in order to save space
when both a minimum and a percentile estimate are required as part of continuous aggregates.
You can simply compute a single percentile estimator and do not need to specify a separate
min aggregate, just extract the
min_val from the percentile estimator.
|The digest to extract the min value from.|
|The minimum value entered into the t-digest.|
SELECT min_val(tdigest(100, data)) FROM generate_series(1, 100) data;
min_val ----------- 1
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