Eliminate warnings in SparkOrcNewRecordReader

Author: MaxGekk

sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/orc/SparkOrcNewRecordReader.java

@@ -22,8 +22,10 @@
 import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
+import org.apache.orc.TypeDescription;
 
 import java.io.IOException;
+import java.util.List;
 
 /**
  * This is based on hive-exec-1.2.1
@@ -41,10 +43,11 @@ public class SparkOrcNewRecordReader extends
 
   public SparkOrcNewRecordReader(Reader file, Configuration conf,
       long offset, long length) throws IOException {
-    if (file.getTypes().isEmpty()) {
+    List<TypeDescription> subTypes = file.getSchema().getChildren();
+    if (subTypes == null) {
       numColumns = 0;
     } else {
-      numColumns = file.getTypes().get(0).getSubtypesCount();
+      numColumns = subTypes.size();
     }
     value = new OrcStruct(numColumns);
     this.reader = OrcInputFormat.createReaderFromFile(file, conf, offset,