error()

Get the maximum relative error for a uddsketch

Since 1.0.0

Get the maximum relative error of a uddsketch. The correct (non-estimated) percentile falls within the range defined by approx_percentile(sketch) +/- (approx_percentile(sketch) * error(sketch)).

Samples

Calculate the maximum relative error when estimating percentiles using uddsketch.

SELECT error(uddsketch(data))
FROM generate_series(0, 100) data;

error
-------
0.001

Arguments

The syntax is:

error(
  sketch UddSketch
) RETURNS DOUBLE PRECISION

Name	Type	Default	Required	Description
sketch	UddSketch	-		The uddsketch to determine the error of

Returns

Column	Type	Description
error	DOUBLE PRECISION	The maximum relative error of any percentile estimate.