I'm repeating what everyone else said. Try to make an extension of the 1x4 L shape leg and add it to the top, or maybe bottom, of the leg. Biscuits, slip tenons, Dominoes, pocket screws, tongue and groove. Adding it to the top or bottom will depend on how the leg attaches to the table top. And whether to make the new wood extension look exactly like the old leg, or a complete contrast, depends on which will look best. Maple, walnut contrast would look good. Trying to get something to contrast with red oak would not be easy, so best to make it look the same.