first¶
Returns true if first datapoint of a sequence, and false otherwise
This is true when the datapoint is first in a sequence. It is useful mainly for filtering:
where first or last
will return the first and last datapoint in your stream:
1,2,3,4,5
1,5
Usage¶
This transform could be finding your wakeup time, based upon the first time you turn on your phone screen in the morning:
where dayhour > 4 | while(day == next:day, first) | t
The above transform removes the datapoints taken from midnight to 4am (to filter out long nights), and then returns the first datapoint of each day, finaally returning only the timestamp.
Transform Details¶
| Input Schema | Output Schema |
|---|---|
{}
| {}
|
