| /* |
| * 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.metastore.iceberg.components.tables; |
| |
| import org.apache.drill.metastore.MetastoreColumn; |
| import org.apache.drill.metastore.components.tables.TableMetadataUnit; |
| import org.apache.drill.metastore.iceberg.IcebergMetastoreContext; |
| import org.apache.drill.metastore.iceberg.operate.Overwrite; |
| import org.apache.drill.metastore.iceberg.transform.OperationTransformer; |
| import org.apache.iceberg.expressions.Expression; |
| |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Metastore Tables component operations transformer that provides mechanism |
| * to convert {@link TableMetadataUnit} data to Metastore overwrite / delete operations. |
| */ |
| public class TablesOperationTransformer extends OperationTransformer<TableMetadataUnit> { |
| |
| public TablesOperationTransformer(IcebergMetastoreContext<TableMetadataUnit> context) { |
| super(context); |
| } |
| |
| /** |
| * Groups given list of {@link TableMetadataUnit} based on table key |
| * (storage plugin, workspace and table name), each table key is grouped by metadata key. |
| * Each group is converted into overwrite operation. |
| * |
| * @param units Metastore component units |
| * @return list of overwrite operations |
| */ |
| public List<Overwrite> toOverwrite(List<TableMetadataUnit> units) { |
| Map<TableKey, Map<String, List<TableMetadataUnit>>> data = units.stream() |
| .collect( |
| Collectors.groupingBy(TableKey::of, |
| Collectors.groupingBy(TableMetadataUnit::metadataKey) |
| )); |
| |
| return data.entrySet().parallelStream() |
| .map(dataEntry -> dataEntry.getValue().entrySet().parallelStream() |
| .map(operationEntry -> { |
| TableKey tableKey = dataEntry.getKey(); |
| |
| String location = tableKey.toLocation(context.table().location()); |
| |
| Map<MetastoreColumn, Object> filterConditions = new HashMap<>(tableKey.toFilterConditions()); |
| filterConditions.put(MetastoreColumn.METADATA_KEY, operationEntry.getKey()); |
| Expression expression = context.transformer().filter().transform(filterConditions); |
| |
| return toOverwrite(location, expression, operationEntry.getValue()); |
| }) |
| .collect(Collectors.toList())) |
| .flatMap(Collection::stream) |
| .collect(Collectors.toList()); |
| } |
| } |