rollup( tws TimeWeightSummary ) RETURNS TimeWeightSummary
An aggregate to compute a combined
TimeWeightSummary from a series of
See Notes on Parallelism and Ordering
for more information.
|The input TimeWeightSummary from a previous |
|A TimeWeightSummary object that can be passed to other functions within the time weighting API|
WITH t as ( SELECT date_trunc('day', ts) as dt, time_weight('Linear', ts, val) AS tw -- get a time weight summary FROM foo WHERE measure_id = 10 GROUP BY date_trunc('day', ts) ), q as ( SELECT rollup(tw) AS full_tw -- do a second level of aggregation to get the full time weighted average FROM t ) SELECT dt, average(tw), -- extract the average from the time weight summary average(tw) / (SELECT average(full_tw) FROM q LIMIT 1) as normalized -- get the normalized average FROM t;
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