PARQUET-161: Review comments for the test case

Author: Yash Datta

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

@@ -339,14 +339,11 @@ public void testWriteReadStatisticsAllNulls() throws Exception {
     writer.close();
 
     ParquetMetadata readFooter = ParquetFileReader.readFooter(configuration, path);
-    for (BlockMetaData block : readFooter.getBlocks()) {
-      for (ColumnChunkMetaData col : block.getColumns()) {
-        col.getPath();
-      }
-    }
-    { // assert the number of nulls are correct for the first block
-      assertEquals(1, (readFooter.getBlocks().get(0).getColumns().get(0).getStatistics().getNumNulls()));
-    }
+    
+    // assert the statistics object is not empty
+    assertTrue((readFooter.getBlocks().get(0).getColumns().get(0).getStatistics().isEmpty()) == false);
+    // assert the number of nulls are correct for the first block
+    assertEquals(1, (readFooter.getBlocks().get(0).getColumns().get(0).getStatistics().getNumNulls()));
   }
 
   private void validateFooters(final List<Footer> metadata) {