num_elements()

The total number of points seen while calculating the CounterSummary. Only points with distinct times are counted, as duplicate times are usually discarded in these calculations.

num_elements(
    summary CounterSummary
) RETURNS BIGINT

For more information about counter aggregation functions, see the hyperfunctions documentation.

Required arguments

NameTypeDescription
summaryCounterSummaryThe input CounterSummary from a counter_agg call

Returns

NameTypeDescription
num_elementsBIGINTThe number of points seen during the counter_agg call

Sample usage

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

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