`window` operations are not pushed down if `option location` is set

[matteo-zanoni]

In the docs it is staded that window should be a pushdown function.
There seems to be a problem causing window not to be pushdown if option location is set to have proper window allignment in a specific timezone.

For testing I used a range of 30 days on 4 series with points every 15 minutes.

The following query (with no location):

import "profiler"

option profiler.enabledProfilers = ["query", "operator"]

from(bucket: "Cliente")
  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "data")
  \\ other filters omitted for brevity
  |> aggregateWindow(every: 1d, fn: first)
  |> yield()

Gives a maxAllocated of approximately 800 bytes and looking at the operator profiler I can see that the whole 1quey has been pushed down (I see only one operation):

result	table	_measurement	Type	Label	Count	MinDuration	MaxDuration	DurationSum	MeanDuration
	1	profiler/operator	*influxdb.readWindowAggregateSource	ReadWindowAggregateByTime19	1	2269362	2269362	2269362	2269362

If I set the location:

import "profiler"
import "timezone"

option profiler.enabledProfilers = ["query", "operator"]
option location = timezone.location(name: "Europe/Rome")

from(bucket: "Cliente")
  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "data")
  \\ other filters omitted for brevity
  |> aggregateWindow(every: 1d, fn: first)
  |> yield()

Gives a maxAllocated of approximately 2.700.000 bytes and looking at the operator profiler I can see that only the filters have been pushed down:

result	table	_measurement	Type	Label	Count	MinDuration	MaxDuration	DurationSum	MeanDuration
	1	profiler/operator	*influxdb.readFilterSource	merged_ReadRange17_filter2_filter3_filter4_filter5_filter6_filter7_filter8_filter9_filter10	1	47373695	47373695	47373695	47373695
	1	profiler/operator	*universe.fixedWindowTransformation	window11	6	2798	12463136	49746537	8291089.5
	1	profiler/operator	*execute.indexSelectorTransformation	first12	126	1654	1633800	2868003	22761.928571428572
	1	profiler/operator	*table.fillTransformation	experimental/table.fill13	126	137	26452	199982	1587.1587301587301
	1	profiler/operator	*universe.schemaMutationTransformation	duplicate14	126	809	33083	434832	3451.0476190476193
	1	profiler/operator	*universe.fixedWindowTransformation	window15	126	910	98258	1029264	8168.761904761905

I expected window to be pushdown regardless of the location. Otherwise it creates a lot of problems with high memory usage.

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