| /* |
| * 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(); |
| } |