| /* |
| * 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.store.mock; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.drill.common.exceptions.ExecutionSetupException; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.exec.ops.ExecutorFragmentContext; |
| import org.apache.drill.exec.ops.FragmentContext; |
| import org.apache.drill.exec.physical.impl.BatchCreator; |
| import org.apache.drill.exec.physical.impl.ScanBatch; |
| import org.apache.drill.exec.physical.impl.protocol.OperatorRecordBatch; |
| import org.apache.drill.exec.physical.impl.scan.ScanOperatorExec; |
| import org.apache.drill.exec.physical.impl.scan.framework.BasicScanFactory; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework.ScanFrameworkBuilder; |
| import org.apache.drill.exec.physical.impl.scan.framework.SchemaNegotiator; |
| import org.apache.drill.exec.record.CloseableRecordBatch; |
| import org.apache.drill.exec.record.RecordBatch; |
| import org.apache.drill.exec.store.RecordReader; |
| import org.apache.drill.exec.store.mock.MockTableDef.MockScanEntry; |
| import com.google.common.base.Preconditions; |
| |
| public class MockScanBatchCreator implements BatchCreator<MockSubScanPOP> { |
| |
| @Override |
| public CloseableRecordBatch getBatch(ExecutorFragmentContext context, MockSubScanPOP config, List<RecordBatch> children) |
| throws ExecutionSetupException { |
| Preconditions.checkArgument(children.isEmpty()); |
| final List<MockScanEntry> entries = config.getReadEntries(); |
| MockScanEntry first = entries.get(0); |
| if (first.isExtended()) { |
| // Extended mode: use the revised, size-aware scan operator |
| |
| return extendedMockScan(context, config, entries); |
| } else { |
| return legacyMockScan(context, config, entries); |
| } |
| } |
| |
| private CloseableRecordBatch extendedMockScan(FragmentContext context, |
| MockSubScanPOP config, List<MockScanEntry> entries) { |
| List<SchemaPath> projList = new LinkedList<>(); |
| projList.add(SchemaPath.STAR_COLUMN); |
| |
| // Create batch readers up front. Handy when we know there are |
| // only one or two; else use an iterator and create them on the fly. |
| |
| final List<ManagedReader<SchemaNegotiator>> readers = new LinkedList<>(); |
| for (final MockTableDef.MockScanEntry e : entries) { |
| readers.add(new ExtendedMockBatchReader(e)); |
| } |
| |
| // Limit the batch size to 10 MB, or whatever the operator definition |
| // specified. |
| |
| int batchSizeBytes = 10 * 1024 * 1024; |
| MockTableDef.MockScanEntry first = entries.get(0); |
| if (first.getBatchSize() > 0) { |
| batchSizeBytes = first.getBatchSize(); |
| } |
| |
| // Set the scan to allow the maximum row count, allowing |
| // each reader to adjust the batch size smaller if desired. |
| |
| ScanFrameworkBuilder builder = new ScanFrameworkBuilder(); |
| builder.batchByteLimit(batchSizeBytes); |
| builder.projection(projList); |
| builder.setReaderFactory(new BasicScanFactory(readers.iterator())); |
| ManagedScanFramework framework = new ManagedScanFramework(builder); |
| |
| return new OperatorRecordBatch( |
| context, config, |
| new ScanOperatorExec(framework, false), false); |
| } |
| |
| private CloseableRecordBatch legacyMockScan(FragmentContext context, |
| MockSubScanPOP config, |
| List<MockScanEntry> entries) throws ExecutionSetupException { |
| final List<RecordReader> readers = new LinkedList<>(); |
| for (final MockTableDef.MockScanEntry e : entries) { |
| readers.add(new MockRecordReader(context, e)); |
| } |
| return new ScanBatch(config, context, readers); |
| } |
| } |