PYSPARK Groupby Sum
from pyspark.sql import functions as func
prova_df.groupBy("order_item_order_id").agg(func.sum("order_item_subtotal")).show()
Crazy Caterpillar
from pyspark.sql import functions as func
prova_df.groupBy("order_item_order_id").agg(func.sum("order_item_subtotal")).show()