parquet/src/test/java/org/apache/iceberg/avro/TestParquetReadProjection.java

/*
 * 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.avro;

import java.io.File;
import java.io.IOException;
import org.apache.avro.generic.GenericData;
import org.apache.iceberg.Files;
import org.apache.iceberg.Schema;
import org.apache.iceberg.io.FileAppender;
import org.apache.iceberg.parquet.Parquet;
import org.apache.iceberg.relocated.com.google.common.collect.Iterables;

public class TestParquetReadProjection extends TestReadProjection {
  @Override
  protected GenericData.Record writeAndRead(String desc,
                                            Schema writeSchema,
                                            Schema readSchema,
                                            GenericData.Record record)
      throws IOException {
    File file = temp.newFile(desc + ".parquet");
    file.delete();

    try (FileAppender<GenericData.Record> appender = Parquet.write(Files.localOutput(file))
        .schema(writeSchema)
        .build()) {
      appender.add(record);
    }

    Iterable<GenericData.Record> records = Parquet.read(Files.localInput(file))
        .project(readSchema)
        .callInit()
        .build();

    return Iterables.getOnlyElement(records);
  }
}