Method: Adds an array of segments to data->intervals object.

Method: Calculate segments for segmenting property bound to product (e.g. category, product_id, variation_id).

Method: Calculate segments for segmenting property bound to order (e.g. coupon or customer type).

Method: Assign segments to time intervals by updating original $intervals array.

Method: Returns an array of segments for totals part of REST response.

Method: Filters definitions for SELECT clauses based on query_args and joins them into one string usable in SELECT clause.

Method: Update row-level db result for segments in ‘totals’ section to the format used for output.

Method: Merges segmented results for totals response part.

Method: Merges segmented results for intervals response part.

Method: Update row-level db result for segments in ‘intervals’ section to the format used for output.