src/java/org/apache/cassandra/db/transform/EmptyPartitionsDiscarder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.cassandra.db.transform;

import org.apache.cassandra.db.rows.BaseRowIterator;

public final class EmptyPartitionsDiscarder extends Transformation<BaseRowIterator<?>>
{
    @Override
    protected BaseRowIterator applyToPartition(BaseRowIterator iterator)
    {
        if (iterator.isEmpty())
        {
            iterator.close();
            return null;
        }

        return iterator;
    }
}