Context:

Currently, the date aggregation service takes care of adding the distributedBy aggregation as a subaggregation to the created date aggregation. This is because until now, the dateAggregationSetrvice was only used for groupBys (since there was no distributed by date (start/end/date variable)). 

However, with OPT-3315, there will also be distributedBys which use the dateAggregationService. Hence, the logic of adding the distributedBy as a subaggregation to the resulting date groupBy aggregation should be extracted from the dateAggregationService.

– more details to be added later –

AT:

more details to be added **