Are there any plans to (or specific decisions not to) support a RETURNING clause on MERGE statements in future versions of Postgres? The only reference I could find in the mailing list archives was this comment, which suggested it was desired but simply not technically feasible at the time.
MERGE INTO customer_account ca USING (SELECT customer_id, transaction_value FROM recent_transactions) AS t ON t.customer_id = ca.customer_id WHEN MATCHED THEN UPDATE SET balance = balance + transaction_value WHEN NOT MATCHED THEN INSERT (customer_id, balance) VALUES (t.customer_id, t.transaction_value)
