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/*
 * 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 com.hazelcast.org.apache.calcite.adapter.enumerable;

import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;

import java.util.List;

/**
 * Information for a call to
 * {@link AggImplementor#implementReset(AggContext, AggResetContext)}.
 *
 * {@link AggResetContext} provides access to the accumulator variables
 * that should be reset.
 */
public interface AggResetContext extends NestedBlockBuilder {
  /**
   * Returns accumulator variables that should be reset.
   * There MUST be an assignment even if you just assign the default value.
   *
   * @return accumulator variables that should be reset or empty list when no
   *   accumulator variables are used by the aggregate implementation.
   *
   * @see AggImplementor#getStateType(com.hazelcast.org.apache.calcite.adapter.enumerable.AggContext)
   */
  List accumulator();
}