galah_group_by: Specify fields to group when downloading record counts
Description
count.data_request() and atlas_counts() support server-side grouping of
data. Grouping can be used to return record counts grouped by multiple, valid
fields (found by search_all(fields)).
Usage
galah_group_by(...)
# S3 method for data_request
group_by(.data, ...)
Value
If any arguments are provided, returns a data.frame with
columns name and type, as per select.data_request().