ImplementableAggFunction.java example

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optiq-master
/*
 * 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 net.hydromatic.optiq;

import net.hydromatic.optiq.rules.java.AggImplementor;

/**
 * Function that can be translated to java code.
 *
 * @see net.hydromatic.optiq.rules.java.AggImplementor
 * @see net.hydromatic.optiq.rules.java.WinAggImplementor
 * @see net.hydromatic.optiq.rules.java.StrictAggImplementor
 * @see net.hydromatic.optiq.rules.java.StrictWinAggImplementor
 */
public interface ImplementableAggFunction extends AggregateFunction {
  /**
   * Returns implementor that translates the function to linq4j expression.
   *
   * @param windowContext true when aggregate is used in window context
   * @return implementor that translates the function to linq4j expression.
   */
  AggImplementor getImplementor(boolean windowContext);
}

// End ImplementableAggFunction.java