Change assertion from null to undefined

Author: mathiasrw

test/test1666.js

@@ -56,7 +56,7 @@ describe('Test ' + test + ' - inner functions for SUM, MIN and MAX', function ()
 					  FROM ?`,
 			data
 		);
-		assert.deepEqual(res, [{a: null}]);
+		assert.deepEqual(res, [{a: undefined}]);
 		assert.strictEqual(res[0].a, undefined);
 
 		var data = [[{a: 2}]];