num_elements()

Get the number of points with distinct timestamps from a gauge aggregate

Early access Since 1.6.0

Get the number of points with distinct timestamps from a gauge aggregate. Duplicate timestamps are ignored.

Samples

Get the number of points for each 15-minute gauge aggregate.

SELECT
    id,
    bucket,
    num_elements(summary)
FROM (
    SELECT
        id,
        time_bucket('15 min'::interval, ts) AS bucket,
        gauge_agg(ts, val) AS summary
    FROM foo
    GROUP BY id, time_bucket('15 min'::interval, ts)
) t

Arguments

The syntax is:

num_elements(
    summary GaugeSummary
) RETURNS BIGINT

Name	Type	Default	Required	Description
summary	GaugeSummary	-	✔	A gauge aggregate created using gauge_agg

Returns

Column	Type	Description
num_elements	BIGINT	The number of points with distinct timestamps