How do we filter customer profiles for active buyers without appending duplicate order columns using left_semi?
left_semi filters the left table to rows matching the right table without bringing in right-table columns.
High-performance set existence checks without row multiplication or unnecessary schema widening.
active_buyers = customers.join(recent_orders, "customer_id", "left_semi")Practice typing production-grade PySpark code for Inclusion Checking with Semi Join.