Minor: Cleanup some tests (apache#3265)

Author: Fokko

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

@@ -131,7 +131,7 @@ public class TestParquetFileWriter {
 
   private static final Logger LOG = LoggerFactory.getLogger(TestParquetFileWriter.class);
 
-  private static final MessageType SCHEMA = MessageTypeParser.parseMessageType("" + "message m {"
+  private static final MessageType SCHEMA = MessageTypeParser.parseMessageType("message m {"
       + "  required group a {"
       + "    required binary b;"
       + "  }"
@@ -155,8 +155,6 @@ public class TestParquetFileWriter {
               Types.required(PrimitiveTypeName.BINARY).named("test_binary"))
           .build();
 
-  private String writeSchema;
-
   @Rule
   public final TemporaryFolder temp = new TemporaryFolder();
 
@@ -1031,7 +1029,7 @@ public void testWriteReadStatisticsAllNulls() throws Exception {
     File testFile = temp.newFile();
     testFile.delete();
 
-    writeSchema = "message example {\n" + "required binary content (UTF8);\n" + "}";
+    String writeSchema = "message example {\n" + "required binary content (UTF8);\n" + "}";
 
     Path path = new Path(testFile.toURI());
 
@@ -1040,7 +1038,7 @@ public void testWriteReadStatisticsAllNulls() throws Exception {
     configuration.setBoolean("parquet.strings.signed-min-max.enabled", true);
     GroupWriteSupport.setSchema(schema, configuration);
 
-    // close any filesystems to ensure that the the FS used by the writer picks up the configuration
+    // close any filesystems to ensure that the FS used by the writer picks up the configuration
     FileSystem.closeAll();
     ParquetWriter<Group> writer = new ParquetWriter<Group>(path, configuration, new GroupWriteSupport());