Update window implementation for new intervals spec

[nathanielc]

See https://github.com/influxdata/platform/blob/master/query/docs/SPEC.md#window

[jben94]

Hi,

I would like to make a request just by taking the hours of work. I noticed that the 'intervals' function should do the job but I can not use it. Is this function implemented?

https://docs.influxdata.com/flux/v0.24/functions/built-in/misc/intervals/

// Work hours from 9AM - 5PM on work days.
intervals(
  every:1d,
  period:8h,
  offset:9h,
  filter:(interval) => !(weekday(time: interval.start) in [Sunday, Saturday]),
)

Test with Basic Intervals : window(intervals: intervals(every:1h))

Regards

[nathanielc]

@jben94 Glad to see that the intervals function would be useful for you. It is not currently implemented. You can follow this issue https://github.com/influxdata/flux/issues/407 for our progress.