com.hazelcast.org.apache.calcite.adapter.enumerable.AggResetContext Maven / Gradle / Ivy
/*
* 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();
}