PARQUET-1647: Add Float16 Interoperability Tests

parquet-hadoop/src/test/java/org/apache/parquet/hadoop/TestInterOpReadFloat16.java

@@ -0,0 +1,169 @@
+/*
+ * 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.parquet.hadoop;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.parquet.example.data.Group;
+import org.apache.parquet.hadoop.example.GroupReadSupport;
+import org.apache.parquet.hadoop.metadata.ColumnChunkMetaData;
+import org.apache.parquet.hadoop.util.HadoopInputFile;
+import org.apache.parquet.io.api.Binary;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TestInterOpReadFloat16 {
+
+  // The link includes a reference to a specific commit. To take a newer version - update this link.
+  private static final String PARQUET_TESTING_REPO = "https://github.com/apache/parquet-testing/raw/da467da/data/";
+  private static String PARQUET_TESTING_PATH = "target/parquet-testing/data";
+  private static String FLOAT16_NONZEROS_NANS_FILE = "float16_nonzeros_and_nans.parquet";
+  private static String FLOAT16_ZEROS_NANS_FILE = "float16_zeros_and_nans.parquet";
+
+  private static final Logger LOG = LoggerFactory.getLogger(TestInterOpReadFloat16.class);
+  private OkHttpClient httpClient = new OkHttpClient();
+
+  @Test
+  public void testInterOpReadFloat16NonZerosAndNansParquetFiles() throws IOException {
+    Path rootPath = new Path(PARQUET_TESTING_PATH);
+    LOG.info("======== testInterOpReadFloat16NonZerosAndNansParquetFiles {} ========", rootPath);
+
+    Path filePath = downloadInterOpFiles(rootPath, FLOAT16_NONZEROS_NANS_FILE, httpClient);
+    final int expectRows = 8;
+    Binary[] c0ExpectValues = {
+      null,
+      Binary.fromConstantByteArray(new byte[] {0x00, 0x3c}),
+      Binary.fromConstantByteArray(new byte[] {0x00, (byte) 0xc0}),
+      Binary.fromConstantByteArray(new byte[] {0x00, 0x7e}),
+      Binary.fromConstantByteArray(new byte[] {0x00, 0x00}),
+      Binary.fromConstantByteArray(new byte[] {0x00, (byte) 0xbc}),
+      Binary.fromConstantByteArray(new byte[] {0x00, (byte) 0x80}),
+      Binary.fromConstantByteArray(new byte[] {0x00, (byte) 0x40}),
+    };
+
+    try (ParquetFileReader reader =
+        ParquetFileReader.open(HadoopInputFile.fromPath(filePath, new Configuration()))) {
+      ColumnChunkMetaData column =
+          reader.getFooter().getBlocks().get(0).getColumns().get(0);
+
+      assertArrayEquals(
+          new byte[] {0x00, (byte) 0xc0}, column.getStatistics().getMinBytes());
+      // 0x40 equals @ in ASCII
+      assertArrayEquals(new byte[] {0x00, 0x40}, column.getStatistics().getMaxBytes());
+    }
+
+    try (ParquetReader<Group> reader =
+        ParquetReader.builder(new GroupReadSupport(), filePath).build()) {
+      for (int i = 0; i < expectRows; ++i) {
+        Group group = reader.read();
+        if (group == null) {
+          fail("Should not reach end of file before " + expectRows + " rows");
+        }
+        if (group.getFieldRepetitionCount(0) != 0) {
+          // Check if the field is not null
+          assertEquals(c0ExpectValues[i], group.getBinary(0, 0));
+        } else {
+          // Check if the field is null
+          assertEquals(0, i);
+        }
+      }
+    }
+  }
+
+  @Test
+  public void testInterOpReadFloat16ZerosAndNansParquetFiles() throws IOException {
+    Path rootPath = new Path(PARQUET_TESTING_PATH);
+    LOG.info("======== testInterOpReadFloat16ZerosAndNansParquetFiles {} ========", rootPath);
+
+    Path filePath = downloadInterOpFiles(rootPath, FLOAT16_ZEROS_NANS_FILE, httpClient);
+    final int expectRows = 3;
+    Binary[] c0ExpectValues = {
+      null,
+      Binary.fromConstantByteArray(new byte[] {0x00, 0x00}),
+      Binary.fromConstantByteArray(new byte[] {0x00, (byte) 0x7e})
+    };
+
+    try (ParquetFileReader reader =
+        ParquetFileReader.open(HadoopInputFile.fromPath(filePath, new Configuration()))) {
+      ColumnChunkMetaData column =
+          reader.getFooter().getBlocks().get(0).getColumns().get(0);
+
+      assertArrayEquals(
+          new byte[] {0x00, (byte) 0x80}, column.getStatistics().getMinBytes());
+      assertArrayEquals(new byte[] {0x00, 0x00}, column.getStatistics().getMaxBytes());
+    }
+
+    try (ParquetReader<Group> reader =
+        ParquetReader.builder(new GroupReadSupport(), filePath).build()) {
+      for (int i = 0; i < expectRows; ++i) {
+        Group group = reader.read();
+        if (group == null) {
+          fail("Should not reach end of file before " + expectRows + " rows");
+        }
+        if (group.getFieldRepetitionCount(0) != 0) {
+          // Check if the field is not null
+          assertEquals(c0ExpectValues[i], group.getBinary(0, 0));
+        } else {
+          // Check if the field is null
+          assertEquals(0, i);
+        }
+      }
+    }
+  }
+
+  private Path downloadInterOpFiles(Path rootPath, String fileName, OkHttpClient httpClient) throws IOException {
+    LOG.info("Download interOp files if needed");
+    Configuration conf = new Configuration();
+    FileSystem fs = rootPath.getFileSystem(conf);
+    LOG.info(rootPath + " exists?: " + fs.exists(rootPath));
+    if (!fs.exists(rootPath)) {
+      LOG.info("Create folder for interOp files: " + rootPath);
+      if (!fs.mkdirs(rootPath)) {
+        throw new IOException("Cannot create path " + rootPath);
+      }
+    }
+
+    Path file = new Path(rootPath, fileName);
+    if (!fs.exists(file)) {
+      String downloadUrl = PARQUET_TESTING_REPO + fileName;
+      LOG.info("Download interOp file: " + downloadUrl);
+      Request request = new Request.Builder().url(downloadUrl).build();
+      Response response = httpClient.newCall(request).execute();
+      if (!response.isSuccessful()) {
+        throw new IOException("Failed to download file: " + response);
+      }
+      try (FSDataOutputStream fdos = fs.create(file)) {
+        fdos.write(response.body().bytes());
+      }
+    }
+    return file;
+  }
+}