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)