[GitHub] [spark] dongjoon-hyun commented on a change in pull request #31560: [SPARK-34432][SQL][TESTS] Add a java implementation of simple writable data source in DataSourceV2Suite

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dongjoon-hyun commented on a change in pull request #31560:
URL: https://github.com/apache/spark/pull/31560#discussion_r577340685



##########
File path: sql/core/src/test/java/test/org/apache/spark/sql/connector/JavaSimpleWritableDataSource.java
##########
@@ -0,0 +1,374 @@
+/*
+ * 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 test.org.apache.spark.sql.connector;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.*;
+import org.apache.spark.deploy.SparkHadoopUtil;
+import org.apache.spark.sql.catalyst.InternalRow;
+import org.apache.spark.sql.catalyst.expressions.GenericInternalRow;
+import org.apache.spark.sql.connector.TestingV2Source;
+import org.apache.spark.sql.connector.catalog.SessionConfigSupport;
+import org.apache.spark.sql.connector.catalog.SupportsWrite;
+import org.apache.spark.sql.connector.catalog.Table;
+import org.apache.spark.sql.connector.read.InputPartition;
+import org.apache.spark.sql.connector.read.PartitionReader;
+import org.apache.spark.sql.connector.read.PartitionReaderFactory;
+import org.apache.spark.sql.connector.read.ScanBuilder;
+import org.apache.spark.sql.connector.write.*;
+import org.apache.spark.sql.types.StructType;
+import org.apache.spark.sql.util.CaseInsensitiveStringMap;
+import org.apache.spark.util.SerializableConfiguration;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.Iterator;

Review comment:
       nit. Could you re-order the import like the following grouping?
   ```java
   import java.io.BufferedReader;
   import java.io.IOException;
   import java.io.InputStreamReader;
   import java.util.Arrays;
   import java.util.Iterator;
   
   import org.apache.hadoop.conf.Configuration;
   import org.apache.hadoop.fs.*;
   
   import org.apache.spark.deploy.SparkHadoopUtil;
   import org.apache.spark.sql.catalyst.InternalRow;
   import org.apache.spark.sql.catalyst.expressions.GenericInternalRow;
   import org.apache.spark.sql.connector.TestingV2Source;
   import org.apache.spark.sql.connector.catalog.SessionConfigSupport;
   import org.apache.spark.sql.connector.catalog.SupportsWrite;
   import org.apache.spark.sql.connector.catalog.Table;
   import org.apache.spark.sql.connector.read.InputPartition;
   import org.apache.spark.sql.connector.read.PartitionReader;
   import org.apache.spark.sql.connector.read.PartitionReaderFactory;
   import org.apache.spark.sql.connector.read.ScanBuilder;
   import org.apache.spark.sql.connector.write.*;
   import org.apache.spark.sql.types.StructType;
   import org.apache.spark.sql.util.CaseInsensitiveStringMap;
   import org.apache.spark.util.SerializableConfiguration;
   ```




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