Jackie-Jiang commented on a change in pull request #6924:
URL: https://github.com/apache/incubator-pinot/pull/6924#discussion_r634808469



##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/indexsegment/immutable/ImmutableSegmentImpl.java
##########
@@ -170,8 +174,12 @@ public ValidDocIndexReader getValidDocIndex() {
 
   @Override
   public GenericRow getRecord(int docId, GenericRow reuse) {
-    // NOTE: Use PinotSegmentRecordReader to read immutable segment
-    throw new UnsupportedOperationException();
+    try {
+      _pinotSegmentRecordReader.getRecord(reuse, docId);

Review comment:
       Also need to close the record reader if not null in `destroy()`

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/indexsegment/immutable/ImmutableSegmentImpl.java
##########
@@ -170,8 +174,12 @@ public ValidDocIndexReader getValidDocIndex() {
 
   @Override
   public GenericRow getRecord(int docId, GenericRow reuse) {
-    // NOTE: Use PinotSegmentRecordReader to read immutable segment
-    throw new UnsupportedOperationException();
+    try {
+      _pinotSegmentRecordReader.getRecord(reuse, docId);

Review comment:
       ```suggestion
         if (_pinotSegmentRecordReader = null) {
           _pinotSegmentRecordReader = new PinotSegmentRecordReader();
           _pinotSegmentRecordReader.init(this);
         }
         _pinotSegmentRecordReader.getRecord(reuse, docId);
   ```




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