Fixing compilation

Author: Alexey Kudinkin

hudi-client/hudi-client-common/src/main/java/org/apache/hudi/table/action/commit/BaseMergeHelper.java

@@ -55,7 +55,7 @@ public abstract class BaseMergeHelper {
   protected ClosableIterator<GenericRecord> getMergingIterator(HoodieTable<?, ?, ?, ?> table,
                                                                HoodieMergeHandle<?, ?, ?, ?> mergeHandle,
                                                                Path bootstrapFilePath,
-                                                               Iterator<GenericRecord> recordIterator) throws IOException {
+                                                               ClosableIterator<GenericRecord> recordIterator) throws IOException {
     Configuration bootstrapFileConfig = new Configuration(table.getHadoopConf());
     HoodieFileReader<GenericRecord> bootstrapReader =
         HoodieFileReaderFactory.getFileReader(bootstrapFileConfig, bootstrapFilePath);

hudi-common/src/main/java/org/apache/hudi/common/util/collection/ClosableMappingIterator.java

@@ -30,6 +30,6 @@ public ClosableMappingIterator(ClosableIterator<T> sourceIterator, Function<T, R
 
   @Override
   public void close() {
-    ((ClosableIterator<T>) sourceIterator).close();
+    ((ClosableIterator<T>) source).close();
   }
 }