org.apache.hadoop.hive.ql.exec.vector.expressions.aggregates.VectorAggregateExpression Maven / Gradle / Ivy
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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 org.apache.hadoop.hive.ql.exec.vector.expressions.aggregates;
import java.io.Serializable;
import org.apache.hadoop.hive.ql.exec.vector.VectorAggregationBufferRow;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.AggregationDesc;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
/**
* Base class for aggregation expressions.
*/
public abstract class VectorAggregateExpression implements Serializable {
private static final long serialVersionUID = 1L;
/**
* Buffer interface to store aggregates.
*/
public static interface AggregationBuffer extends Serializable {
int getVariableSize();
void reset();
};
public abstract AggregationBuffer getNewAggregationBuffer() throws HiveException;
public abstract void aggregateInput(AggregationBuffer agg, VectorizedRowBatch unit)
throws HiveException;
public abstract void aggregateInputSelection(VectorAggregationBufferRow[] aggregationBufferSets,
int aggregateIndex, VectorizedRowBatch vrg) throws HiveException;
public abstract void reset(AggregationBuffer agg) throws HiveException;
public abstract Object evaluateOutput(AggregationBuffer agg) throws HiveException;
public abstract ObjectInspector getOutputObjectInspector();
public abstract int getAggregationBufferFixedSize();
public boolean hasVariableSize() {
return false;
}
public abstract void init(AggregationDesc desc) throws HiveException;
}