| /* |
| * 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.unnest; |
| |
| 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.IntVector; |
| import org.apache.drill.exec.vector.complex.RepeatedValueVector; |
| |
| import java.util.List; |
| |
| /** |
| * Placeholder for future unnest implementation that may require code generation. Current implementation does not |
| * require any |
| * @see UnnestImpl |
| */ |
| public interface Unnest { |
| //TemplateClassDefinition<Unnest> TEMPLATE_DEFINITION = new TemplateClassDefinition<Unnest>(Unnest.class, UnnestImpl |
| // .class); |
| |
| void setup(FragmentContext context, RecordBatch incoming, RecordBatch outgoing, List<TransferPair> transfers) |
| throws SchemaChangeException; |
| |
| /** |
| * Performs the actual unnest operation. |
| * @param recordCount |
| * @return number of values in output |
| */ |
| int unnestRecords(int recordCount); |
| |
| /** |
| * Set the field to be unnested |
| * @param repeatedColumn |
| */ |
| void setUnnestField(RepeatedValueVector repeatedColumn); |
| |
| /** |
| * Set the maximum number of values allowed in the output. |
| * @param outputCount |
| */ |
| void setOutputCount(int outputCount); |
| |
| RepeatedValueVector getUnnestField(); |
| |
| /** |
| * Set the vector for the rowId implicit column |
| */ |
| void setRowIdVector (IntVector v); |
| |
| /** |
| * Reset the index at which the incoming vector is being processed. Called every |
| * time a new batch comes in. |
| */ |
| void resetGroupIndex(); |
| |
| void close(); |
| } |