| /* |
| * 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.hudi.hive; |
| |
| import org.apache.parquet.schema.MessageType; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.StringJoiner; |
| |
| /** |
| * Represents the schema difference between the storage schema and hive table schema. |
| */ |
| public class SchemaDifference { |
| |
| private final MessageType storageSchema; |
| private final Map<String, String> tableSchema; |
| private final List<String> deleteColumns; |
| private final Map<String, String> updateColumnTypes; |
| private final Map<String, String> addColumnTypes; |
| |
| private SchemaDifference(MessageType storageSchema, Map<String, String> tableSchema, List<String> deleteColumns, |
| Map<String, String> updateColumnTypes, Map<String, String> addColumnTypes) { |
| this.storageSchema = storageSchema; |
| this.tableSchema = tableSchema; |
| this.deleteColumns = Collections.unmodifiableList(deleteColumns); |
| this.updateColumnTypes = Collections.unmodifiableMap(updateColumnTypes); |
| this.addColumnTypes = Collections.unmodifiableMap(addColumnTypes); |
| } |
| |
| public List<String> getDeleteColumns() { |
| return deleteColumns; |
| } |
| |
| public Map<String, String> getUpdateColumnTypes() { |
| return updateColumnTypes; |
| } |
| |
| public Map<String, String> getAddColumnTypes() { |
| return addColumnTypes; |
| } |
| |
| public static Builder newBuilder(MessageType storageSchema, Map<String, String> tableSchema) { |
| return new Builder(storageSchema, tableSchema); |
| } |
| |
| public boolean isEmpty() { |
| return deleteColumns.isEmpty() && updateColumnTypes.isEmpty() && addColumnTypes.isEmpty(); |
| } |
| |
| @Override |
| public String toString() { |
| return new StringJoiner(", ", SchemaDifference.class.getSimpleName() + "[", "]") |
| .add("storageSchema=" + storageSchema) |
| .add("tableSchema=" + tableSchema) |
| .add("deleteColumns=" + deleteColumns) |
| .add("updateColumnTypes=" + updateColumnTypes) |
| .add("addColumnTypes=" + addColumnTypes) |
| .toString(); |
| } |
| |
| public static class Builder { |
| |
| private final MessageType storageSchema; |
| private final Map<String, String> tableSchema; |
| private List<String> deleteColumns; |
| private Map<String, String> updateColumnTypes; |
| private Map<String, String> addColumnTypes; |
| |
| public Builder(MessageType storageSchema, Map<String, String> tableSchema) { |
| this.storageSchema = storageSchema; |
| this.tableSchema = tableSchema; |
| deleteColumns = new ArrayList<>(); |
| updateColumnTypes = new HashMap<>(); |
| addColumnTypes = new LinkedHashMap<>(); |
| } |
| |
| public Builder deleteTableColumn(String column) { |
| deleteColumns.add(column); |
| return this; |
| } |
| |
| public Builder updateTableColumn(String column, String storageColumnType) { |
| updateColumnTypes.put(column, storageColumnType); |
| return this; |
| } |
| |
| public Builder addTableColumn(String name, String type) { |
| addColumnTypes.put(name, type); |
| return this; |
| } |
| |
| public SchemaDifference build() { |
| return new SchemaDifference(storageSchema, tableSchema, deleteColumns, updateColumnTypes, addColumnTypes); |
| } |
| } |
| } |