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The Athena Query Federation SDK defines a set of interfaces and wire protocols that you can implement to enable Athena to delegate portions of it's query execution plan to code that you deploy/write.

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package com.amazonaws.athena.connector.lambda;

/*-
 * #%L
 * Amazon Athena Query Federation SDK
 * %%
 * Copyright (C) 2019 Amazon Web Services
 * %%
 * 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.
 * #L%
 */

import java.util.Collection;

/**
 * Simple collection helper that reduces duplicate code and allows us to avoid taking extra dependencies
 * on libraries that have some of these helpers built in but would bloat the deployment artifact of our
 * Lambda functions.
 */
public class CollectionsUtils
{
    private CollectionsUtils() {}

    public static boolean equals(Collection lhs, Collection rhs)
    {
        if (lhs == null && rhs == null) {
            return true;
        }

        if ((lhs == null && rhs != null) || (lhs != null && rhs == null)) {
            return false;
        }

        if (lhs.size() != rhs.size()) {
            return false;
        }

        return lhs.containsAll(rhs);
    }
}