Code Inspection: Using CASE instead of COALESCE function and vice versa

Reports situations when CASE and COALESCE calls are interchangeable. This inspection has the following intention actions: Replace with 'COALESCE' call and the opposite one Replace with CASE expression.

Example (MySQL):

SELECT
  -- this CASE may be replaced by COALESCE
	CASE
		WHEN C1 IS NOT NULL THEN C1
		ELSE 0
		END
FROM dual;

In the example, the CASE statement can be replaced with SELECT COALESCE(C1, 0) that produces the same output.

If you prefer using CASE expressions, select the Prefer CASE expressions over COALESCE function option on the inspection page.