/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.util;

public interface Mergeable<T>
{
    T mergeWith(T other);
}

@@ -590,16 +590,44 @@
 .util;%0A%0A
+import java.util.Optional;%0A%0A
 public i
@@ -675,11 +675,349 @@
  other);
+%0A%0A    static %3CT extends Mergeable%3CT%3E%3E Optional%3CT%3E merge(Optional%3CT%3E first, Optional%3CT%3E second)%0A    %7B%0A        if (first.isPresent() && second.isPresent()) %7B%0A            return Optional.of(first.get().mergeWith(second.get()));%0A        %7D%0A        else if (first.isPresent()) %7B%0A            return first;%0A        %7D%0A%0A        return second;%0A    %7D
 %0A%7D%0A

Make Mergeable capable of merging Optionals