content: /*
   * 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.arrow.dataset.file;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Objects;
  import java.util.Set;
  import java.util.stream.Collectors;
  import org.apache.arrow.dataset.ParquetWriteSupport;
  import org.apache.arrow.dataset.TestDataset;
  import org.apache.arrow.dataset.jni.NativeMemoryPool;
  import org.apache.arrow.dataset.scanner.ArrowScannerReader;
  import org.apache.arrow.dataset.scanner.ScanOptions;
  import org.apache.arrow.dataset.scanner.Scanner;
  import org.apache.arrow.dataset.source.Dataset;
  import org.apache.commons.io.FileUtils;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.io.TempDir;
  
  public class TestDatasetFileWriter extends TestDataset {
  
    @TempDir public File TMP;
  
    public static final String AVRO_SCHEMA_USER = "user.avsc";
  
    @Test
    public void testParquetWriteSimple() throws Exception {
      ParquetWriteSupport writeSupport =
          ParquetWriteSupport.writeTempFile(AVRO_SCHEMA_USER, TMP, 1, "a", 2, "b", 3, "c", 2, "d");
      String sampleParquet = writeSupport.getOutputURI();
      ScanOptions options = new ScanOptions(new String[0], 100);
      final File writtenFolder = new File(TMP, "writtenFolder");
      writtenFolder.mkdirs();
      final String writtenParquet = writtenFolder.toURI().toString();
      try (FileSystemDatasetFactory factory =
              new FileSystemDatasetFactory(
                  rootAllocator(), NativeMemoryPool.getDefault(), FileFormat.PARQUET, sampleParquet);
          final Dataset dataset = factory.finish();
          final Scanner scanner = dataset.newScan(options);
          final ArrowScannerReader reader = new ArrowScannerReader(scanner, rootAllocator()); ) {
        DatasetFileWriter.write(rootAllocator(), reader, FileFormat.PARQUET, writtenParquet);
        assertParquetFileEquals(
            sampleParquet, Objects.requireNonNull(writtenFolder.listFiles())[0].toURI().toString());
      }
    }
  
    @Test
    public void testParquetWriteWithPartitions() throws Exception {
      ParquetWriteSupport writeSupport =
          ParquetWriteSupport.writeTempFile(AVRO_SCHEMA_USER, TMP, 1, "a", 2, "b", 3, "c", 2, "d");
      String sampleParquet = writeSupport.getOutputURI();
      ScanOptions options = new ScanOptions(new String[0], 100);
      final File writtenFolder = new File(TMP, "writtenFolder");
      writtenFolder.mkdirs();
      final String writtenParquet = writtenFolder.toURI().toString();
  
      try (FileSystemDatasetFactory factory =
              new FileSystemDatasetFactory(
                  rootAllocator(), NativeMemoryPool.getDefault(), FileFormat.PARQUET, sampleParquet);
          final Dataset dataset = factory.finish();
          final Scanner scanner = dataset.newScan(options);
          final ArrowScannerReader reader = new ArrowScannerReader(scanner, rootAllocator()); ) {
        DatasetFileWriter.write(
            rootAllocator(),
            reader,
            FileFormat.PARQUET,
            writtenParquet,
            new String[] {"id", "name"},
            100,
            "data_{i}");
        final Set<String> expectedOutputFiles =
            new HashSet<>(
                Arrays.asList(
                    "id=1/name=a/data_0",
                    "id=2/name=b/data_0",
                    "id=3/name=c/data_0",
                    "id=2/name=d/data_0"));
        final Set<String> outputFiles =
            FileUtils.listFiles(writtenFolder, null, true).stream()
                .map(
                    file -> {
                      return writtenFolder.toURI().relativize(file.toURI()).toString();
                    })
                .collect(Collectors.toSet());
        assertEquals(expectedOutputFiles, outputFiles);
      }
    }
  }
  