In De la Beckwith v. Superior Court (1905) 146 Cal. 496, the California Supreme Court recognized: "It is a most common occurrence for a trial court to change its rulings during the progress of a trial, upon questions of law, and no one would contend that it is not within its power to do so, or that it should not do so when satisfied that the former ruling was erroneous." (Id. at p. 499.)