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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.drill.exec.physical.impl.flatten;
import java.util.List;
import org.apache.drill.exec.compile.TemplateClassDefinition;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.TransferPair;
import org.apache.drill.exec.vector.complex.RepeatedValueVector;
public interface Flattener {
TemplateClassDefinition<Flattener> TEMPLATE_DEFINITION = new TemplateClassDefinition<Flattener>(Flattener.class, FlattenTemplate.class);
void setup(FragmentContext context, RecordBatch incoming, RecordBatch outgoing, List<TransferPair> transfers) throws SchemaChangeException;
interface Monitor {
/**
* Get the required buffer size for the specified number of records.
* {@see ValueVector#getBufferSizeFor(int)} for the meaning of this.
*
* @param recordCount the number of records processed so far
* @return the buffer size the vectors report as being in use
*/
int getBufferSizeFor(int recordCount);
}
int flattenRecords(int recordCount, int firstOutputIndex, Monitor monitor);
void setFlattenField(RepeatedValueVector repeatedColumn);
void setOutputCount(int outputCount);
RepeatedValueVector getFlattenField();
void resetGroupIndex();
}