| /* |
| * 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.planner.index; |
| |
| import org.apache.drill.exec.physical.base.AbstractDbGroupScan; |
| import org.apache.drill.exec.planner.common.DrillScanRelBase; |
| import org.apache.drill.exec.planner.logical.DrillTable; |
| import org.apache.drill.exec.planner.physical.ScanPrel; |
| import org.apache.calcite.rel.RelNode; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * IndexDiscoverBase is the layer to read index configurations of tables on storage plugins, |
| * then based on the properties it collected, get the StoragePlugin from StoragePluginRegistry, |
| * together with indexes information, build an IndexCollection |
| */ |
| public abstract class IndexDiscoverBase implements IndexDiscover { |
| static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(IndexDiscoverBase.class); |
| |
| private AbstractDbGroupScan scan; // group scan corresponding to the primary table |
| private RelNode scanRel; // physical scan rel corresponding to the primary table |
| |
| public IndexDiscoverBase(AbstractDbGroupScan inScan, DrillScanRelBase inScanPrel) { |
| scan = inScan; |
| scanRel = inScanPrel; |
| } |
| |
| public IndexDiscoverBase(AbstractDbGroupScan inScan, ScanPrel inScanPrel) { |
| scan = inScan; |
| scanRel = inScanPrel; |
| } |
| |
| public AbstractDbGroupScan getOriginalScan() { |
| return scan; |
| } |
| |
| public RelNode getOriginalScanRel() { |
| return scanRel; |
| } |
| |
| public IndexCollection getTableIndex(String tableName, String storageName, Collection<DrillIndexDefinition> indexDefs ) { |
| Set<DrillIndexDescriptor> idxSet = new HashSet<>(); |
| for (DrillIndexDefinition def : indexDefs) { |
| DrillIndexDescriptor indexDescriptor = new DrillIndexDescriptor(def); |
| materializeIndex(storageName, indexDescriptor); |
| } |
| return new DrillIndexCollection(getOriginalScanRel(), idxSet); |
| } |
| |
| public void materializeIndex(String storageName, DrillIndexDescriptor index) { |
| index.setStorageName(storageName); |
| index.setDrillTable(buildDrillTable(index)); |
| } |
| |
| /** |
| * When there is storageName in IndexDescriptor, get a DrillTable instance based on the |
| * StorageName and other informaiton in idxDesc that helps identifying the table. |
| * @param idxDesc |
| * @return |
| */ |
| public DrillTable getExternalDrillTable(IndexDescriptor idxDesc) { |
| //XX: get table object for this index, index storage plugin should provide interface to get the DrillTable object |
| return null; |
| } |
| |
| /** |
| * Abstract function getDrillTable will be implemented the IndexDiscover within storage plugin(e.g. HBase, MaprDB) |
| * since the implementations of AbstractStoragePlugin, IndexDescriptor and DrillTable in that storage plugin may have |
| * the implement details. |
| * @param idxDesc |
| |
| * @return |
| */ |
| public DrillTable buildDrillTable(IndexDescriptor idxDesc) { |
| if(idxDesc.getIndexType() == IndexDescriptor.IndexType.EXTERNAL_SECONDARY_INDEX) { |
| return getExternalDrillTable(idxDesc); |
| } |
| else { |
| return getNativeDrillTable(idxDesc); |
| } |
| } |
| |
| /** |
| * When it is native index(index provided by native storage plugin), |
| * the actual IndexDiscover should provide the implementation to get the DrillTable object of index, |
| * Otherwise, we call IndexDiscoverable interface exposed from external storage plugin's SchemaFactory |
| * to get the desired DrillTable. |
| * @param idxDesc |
| * @return |
| */ |
| public abstract DrillTable getNativeDrillTable(IndexDescriptor idxDesc); |
| |
| } |