Update invoke_purchase_propensity_training_preparation.sqlx

Author: chmstimoteo

sql/query/invoke_purchase_propensity_training_preparation.sqlx

@@ -54,17 +54,18 @@ SET validation_split_end_number = {{validation_split_end_number}};
 SET purchasers = (SELECT COUNT(DISTINCT user_pseudo_id) 
                 FROM `{{mds_project_id}}.{{mds_dataset}}.event`
                 WHERE event_name = 'purchase' AND
-                event_date BETWEEN train_start_date AND train_end_date
+                event_date BETWEEN min_date AND max_date
                 );
 
--- If there are purchasers no changes to the train_start_date and train_end_date
--- Else, expand the interval, hopefully a purchaser will be in the interval
-IF purchasers > 0 THEN
-    SET train_start_date =  GREATEST(train_start_date, min_date);
-    SET train_end_date = LEAST(train_end_date, max_date);
-ELSE
+-- Setting Training Dates
+-- If there are churners in the training set, then keep the calculated dates, or else set
+-- the start and end dates to a fixed interval preventing `train_start_date` and `train_end_date` from being NULL.
+IF churners > 0 THEN
     SET train_start_date =  min_date;
     SET train_end_date = max_date;
+ELSE
+    SET train_start_date =  DATE '2000-01-01';
+    SET train_end_date = DATE '2024-12-01';
 END IF;
 
 -- Finally, the script calls a stored procedure, passing the adjusted training dates and split numbers as arguments. This stored procedure