Method: Returns true if there are any intervals that need to be filled in the response.

Method: Updates the LIMIT query part for Intervals query of the report.

Method: Casts strings returned from the database to appropriate data types for output.

Method: Returns a list of columns selected by the query_args formatted as a comma separated string.

Method: Get the excluded order statuses used when calculating reports.

Method: Maps order status provided by the user to the one used in the database.

Method: Normalizes order_by clause to match to SQL query.

Method: Sorts intervals according to user’s request.

Method: Sorts array of arrays based on subarray key $sort_by.

Method: Returns string to be used as cache key for the data.