change the logic of getting orc column count in DFSUtil.java

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/classes" />
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

hdfsreader/src/main/java/com/alibaba/datax/plugin/reader/hdfsreader/DFSUtil.java

@@ -486,15 +486,10 @@ public class DFSUtil {
     }
 
     private int getAllColumnsCount(String filePath) {
-        int columnsCount;
-        final String colFinal = "_col";
         Path path = new Path(filePath);
         try {
             Reader reader = OrcFile.createReader(path, OrcFile.readerOptions(hadoopConf));
-            String type_struct = reader.getObjectInspector().getTypeName();
-            columnsCount = (type_struct.length() - type_struct.replace(colFinal, "").length())
-                    / colFinal.length();
-            return columnsCount;
+            return reader.getTypes().get(0).getSubtypesCount();
         } catch (IOException e) {
             String message = "读取orcfile column列数失败，请联系系统管理员";
             throw DataXException.asDataXException(HdfsReaderErrorCode.READ_FILE_ERROR, message);