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.

Method: Fetches all segment ids from db and stores it for later use.

Method: Constructor.