Add Statistics Test for Parquet Columns

Author: sircodesalotOfTheRound

parquet-hadoop/src/test/java/org/apache/parquet/statistics/DataGenerationContext.java

@@ -0,0 +1,82 @@
+/*
+ * 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.statistics;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.parquet.column.ParquetProperties;
+import org.apache.parquet.example.data.Group;
+import org.apache.parquet.hadoop.ParquetWriter;
+import org.apache.parquet.hadoop.example.GroupWriteSupport;
+import org.apache.parquet.hadoop.metadata.CompressionCodecName;
+import org.apache.parquet.schema.MessageType;
+
+import java.io.IOException;
+
+public class DataGenerationContext {
+  public static abstract class WriteContext {
+    protected final String path;
+    protected final Path fsPath;
+    protected final MessageType schema;
+    protected final int blockSize;
+    protected final int pageSize;
+    protected final boolean enableDictionary;
+    protected final boolean enableValidation;
+    protected final ParquetProperties.WriterVersion version;
+
+    public WriteContext(String path, MessageType schema, int blockSize, int pageSize, boolean enableDictionary, boolean enableValidation, ParquetProperties.WriterVersion version) throws IOException {
+      this.path = path;
+      this.fsPath = new Path(path);
+      this.schema = schema;
+      this.blockSize = blockSize;
+      this.pageSize = pageSize;
+      this.enableDictionary = enableDictionary;
+      this.enableValidation = enableValidation;
+      this.version = version;
+    }
+
+    public abstract void write(ParquetWriter<Group> writer) throws IOException;
+    public abstract void test() throws IOException;
+  }
+
+  public static void write(WriteContext context) throws IOException {
+    // Create the configuration, and then apply the schema to our configuration.
+    Configuration configuration = new Configuration();
+    GroupWriteSupport.setSchema(context.schema, configuration);
+    GroupWriteSupport groupWriteSupport = new GroupWriteSupport();
+
+    // Create the writer properties
+    final int blockSize = context.blockSize;
+    final int pageSize = context.pageSize;
+    final int dictionaryPageSize = pageSize;
+    final boolean enableDictionary = context.enableDictionary;
+    final boolean enableValidation = context.enableValidation;
+    ParquetProperties.WriterVersion writerVersion = context.version;
+    CompressionCodecName codec = CompressionCodecName.UNCOMPRESSED;
+
+    ParquetWriter<Group> writer = new ParquetWriter<Group>(context.fsPath, groupWriteSupport, codec, blockSize,
+      pageSize, dictionaryPageSize, enableDictionary, enableValidation, writerVersion, configuration);
+
+    context.write(writer);
+    writer.close();
+
+    context.test();
+  }
+}