| /* |
| * 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.iceberg.pig; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import org.apache.iceberg.Schema; |
| import org.apache.iceberg.relocated.com.google.common.collect.Lists; |
| import org.apache.iceberg.types.Type; |
| import org.apache.iceberg.types.Types; |
| import org.apache.pig.ResourceSchema; |
| import org.apache.pig.ResourceSchema.ResourceFieldSchema; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| |
| public class SchemaUtil { |
| |
| private SchemaUtil() { |
| } |
| |
| public static ResourceSchema convert(Schema icebergSchema) throws IOException { |
| ResourceSchema result = new ResourceSchema(); |
| result.setFields(convertFields(icebergSchema.columns())); |
| return result; |
| } |
| |
| private static ResourceFieldSchema convert(Types.NestedField field) throws IOException { |
| ResourceFieldSchema result = convert(field.type()); |
| result.setName(field.name()); |
| result.setDescription(String.format("FieldId: %s", field.fieldId())); |
| |
| return result; |
| } |
| |
| private static ResourceFieldSchema convert(Type type) throws IOException { |
| ResourceFieldSchema result = new ResourceFieldSchema(); |
| result.setType(convertType(type)); |
| |
| if (!type.isPrimitiveType()) { |
| result.setSchema(convertComplex(type)); |
| } |
| |
| return result; |
| } |
| |
| private static ResourceFieldSchema [] convertFields(List<Types.NestedField> fields) throws IOException { |
| List<ResourceFieldSchema> result = Lists.newArrayList(); |
| |
| for (Types.NestedField nf : fields) { |
| result.add(convert(nf)); |
| } |
| |
| return result.toArray(new ResourceFieldSchema[0]); |
| } |
| |
| private static byte convertType(Type type) throws IOException { |
| switch (type.typeId()) { |
| case BOOLEAN: return DataType.BOOLEAN; |
| case INTEGER: return DataType.INTEGER; |
| case LONG: return DataType.LONG; |
| case FLOAT: return DataType.FLOAT; |
| case DOUBLE: return DataType.DOUBLE; |
| case TIMESTAMP: return DataType.CHARARRAY; |
| case DATE: return DataType.CHARARRAY; |
| case STRING: return DataType.CHARARRAY; |
| case FIXED: return DataType.BYTEARRAY; |
| case BINARY: return DataType.BYTEARRAY; |
| case DECIMAL: return DataType.BIGDECIMAL; |
| case STRUCT: return DataType.TUPLE; |
| case LIST: return DataType.BAG; |
| case MAP: return DataType.MAP; |
| default: |
| throw new FrontendException("Unsupported primitive type:" + type); |
| } |
| } |
| |
| private static ResourceSchema convertComplex(Type type) throws IOException { |
| ResourceSchema result = new ResourceSchema(); |
| |
| switch (type.typeId()) { |
| case STRUCT: |
| Types.StructType structType = type.asStructType(); |
| |
| List<ResourceFieldSchema> fields = Lists.newArrayList(); |
| |
| for (Types.NestedField f : structType.fields()) { |
| fields.add(convert(f)); |
| } |
| |
| result.setFields(fields.toArray(new ResourceFieldSchema[0])); |
| |
| return result; |
| case LIST: |
| Types.ListType listType = type.asListType(); |
| |
| ResourceFieldSchema [] elementFieldSchemas = new ResourceFieldSchema[]{convert(listType.elementType())}; |
| |
| if (listType.elementType().isStructType()) { |
| result.setFields(elementFieldSchemas); |
| } else { |
| // Wrap non-struct types in tuples |
| ResourceSchema elementSchema = new ResourceSchema(); |
| elementSchema.setFields(elementFieldSchemas); |
| |
| ResourceFieldSchema tupleSchema = new ResourceFieldSchema(); |
| tupleSchema.setType(DataType.TUPLE); |
| tupleSchema.setSchema(elementSchema); |
| |
| result.setFields(new ResourceFieldSchema[]{tupleSchema}); |
| } |
| |
| return result; |
| case MAP: |
| Types.MapType mapType = type.asMapType(); |
| |
| if (mapType.keyType().typeId() != Type.TypeID.STRING) { |
| throw new FrontendException("Unsupported map key type: " + mapType.keyType()); |
| } |
| result.setFields(new ResourceFieldSchema[]{convert(mapType.valueType())}); |
| |
| return result; |
| default: |
| throw new FrontendException("Unsupported complex type: " + type); |
| } |
| } |
| |
| public static Schema project(Schema schema, List<String> requiredFields) { |
| List<Types.NestedField> columns = Lists.newArrayList(); |
| |
| for (String column : requiredFields) { |
| columns.add(schema.findField(column)); |
| } |
| |
| return new Schema(columns); |
| } |
| |
| } |