truncateTimeColumn() function
truncateTimeColumn()
truncates all input time values in the _time
to a
specified unit.
Truncate to weeks
When truncating a time value to the week (1w
), weeks are determined using the
Unix epoch (1970-01-01T00:00:00Z UTC). The Unix epoch was on a Thursday,
so all calculated weeks begin on Thursday.
Function type signature
(<-tables: stream[{B with _time: C}], unit: duration, ?timeColumn: A) => stream[{B with _time: C, _time: time}] where C: Timeable
Parameters
unit
(Required) Unit of time to truncate to.
Example units:
- 1ns (nanosecond)
- 1us (microsecond)
- 1ms (millisecond)
- 1s (second)
- 1m (minute)
- 1h (hour)
- 1d (day)
- 1w (week)
- 1mo (month)
- 1y (year)
timeColumn
Time column to truncate. Default is _time
.
Note: Currently, assigning a custom value to this parameter will have no effect.
tables
Input data. Default is piped-forward data (<-
).
Examples
Truncate all time values to the minute
import "sampledata"
sampledata.int()
|> truncateTimeColumn(unit: 1m)
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