org.apache.phoenix.iterate.OrderedAggregatingResultIterator 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 org.apache.phoenix.iterate;
import java.sql.SQLException;
import java.util.List;
import org.apache.phoenix.expression.OrderByExpression;
import org.apache.phoenix.expression.aggregator.Aggregator;
import org.apache.phoenix.schema.tuple.Tuple;
/**
* Result scanner that sorts aggregated rows by columns specified in the ORDER BY clause.
*
* Note that currently the sort is entirely done in memory.
*
*
* @since 0.1
*/
public class OrderedAggregatingResultIterator extends OrderedResultIterator implements AggregatingResultIterator {
public OrderedAggregatingResultIterator(AggregatingResultIterator delegate,
List orderByExpressions, boolean spoolingEnabled, long thresholdBytes,
Integer limit, Integer offset)
throws SQLException {
super(delegate, orderByExpressions, spoolingEnabled, thresholdBytes, limit, offset);
}
@Override
protected AggregatingResultIterator getDelegate() {
return (AggregatingResultIterator)super.getDelegate();
}
@Override
public Tuple next() throws SQLException {
Tuple tuple = super.next();
if (tuple != null) {
aggregate(tuple);
}
return tuple;
}
@Override
public Aggregator[] aggregate(Tuple result) {
return getDelegate().aggregate(result);
}
}