| /** |
| * 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.crunch.io.parquet; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNull; |
| |
| import com.google.common.collect.Lists; |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.List; |
| import org.apache.avro.Schema; |
| import org.apache.avro.generic.GenericData.Record; |
| import org.apache.avro.generic.GenericRecord; |
| import org.apache.crunch.test.Person; |
| import org.apache.crunch.test.TemporaryPath; |
| import org.apache.crunch.test.TemporaryPaths; |
| import org.apache.crunch.types.avro.AvroType; |
| import org.apache.crunch.types.avro.Avros; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Rule; |
| import org.junit.Test; |
| import org.apache.parquet.avro.AvroParquetWriter; |
| |
| public class AvroParquetFileReaderFactoryTest { |
| |
| private File parquetFile; |
| |
| @Rule |
| public transient TemporaryPath tmpDir = TemporaryPaths.create(); |
| |
| @Before |
| public void setUp() throws IOException { |
| parquetFile = tmpDir.getFile("test.avro.parquet"); |
| } |
| |
| @After |
| public void tearDown() { |
| parquetFile.delete(); |
| } |
| |
| private void populateGenericFile(List<GenericRecord> genericRecords, Schema schema) throws IOException { |
| AvroParquetWriter<GenericRecord> writer = new AvroParquetWriter<GenericRecord>( |
| new Path(parquetFile.getPath()), schema); |
| |
| for (GenericRecord record : genericRecords) { |
| writer.write(record); |
| } |
| |
| writer.close(); |
| } |
| |
| private <T> AvroParquetFileReaderFactory<T> createFileReaderFactory(AvroType<T> avroType) { |
| return new AvroParquetFileReaderFactory<T>(avroType); |
| } |
| |
| @Test |
| public void testProjection() throws IOException { |
| String genericSchemaJson = Person.SCHEMA$.toString().replace("Person", "GenericPerson"); |
| Schema genericPersonSchema = new Schema.Parser().parse(genericSchemaJson); |
| GenericRecord savedRecord = new Record(genericPersonSchema); |
| savedRecord.put("name", "John Doe"); |
| savedRecord.put("age", 42); |
| savedRecord.put("siblingnames", Lists.newArrayList("Jimmy", "Jane")); |
| populateGenericFile(Lists.newArrayList(savedRecord), genericPersonSchema); |
| |
| Schema projection = Schema.createRecord("projection", null, null, false); |
| projection.setFields(Lists.newArrayList(cloneField(genericPersonSchema.getField("name")))); |
| AvroParquetFileReaderFactory<Record> genericReader = createFileReaderFactory(Avros.generics(projection)); |
| Iterator<Record> recordIterator = genericReader.read(FileSystem.getLocal(new Configuration()), |
| new Path(this.parquetFile.getAbsolutePath())); |
| |
| GenericRecord genericRecord = recordIterator.next(); |
| assertEquals(savedRecord.get("name"), genericRecord.get("name")); |
| assertNull(genericRecord.get("age")); |
| assertFalse(recordIterator.hasNext()); |
| } |
| |
| public static Schema.Field cloneField(Schema.Field field) { |
| return new Schema.Field(field.name(), field.schema(), field.doc(), field.defaultVal()); |
| } |
| |
| } |