Jackie-Jiang commented on a change in pull request #7839:
URL: https://github.com/apache/pinot/pull/7839#discussion_r765297891



##########
File path: 
pinot-common/src/main/java/org/apache/pinot/common/utils/DataTable.java
##########
@@ -35,9 +35,16 @@
 
   void addException(ProcessingException processingException);
 
+  void addException(int exceptionCode, String exceptionMsg);
+
   Map<Integer, String> getExceptions();
 
-  byte[] toBytes()
+  default byte[] toBytes()
+      throws IOException {
+    return toBytes(false);
+  }
+
+  byte[] toBytes(boolean isStrippingMetadata)

Review comment:
       I don't see the usage of `toBytes(true)`

##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/common/datatable/DataTableImplV2.java
##########
@@ -188,10 +193,13 @@ public void addException(ProcessingException 
processingException) {
     }
 
     // Write metadata.
-    dataOutputStream.writeInt(dataOffset);
-    byte[] metadataBytes = serializeMetadata();
-    dataOutputStream.writeInt(metadataBytes.length);
-    dataOffset += metadataBytes.length;
+    byte[] metadataBytes = null;

Review comment:
       This won't work as the deserializer expect the metadata to be present 
even if it is empty

##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/common/datatable/DataTableUtils.java
##########
@@ -107,6 +108,34 @@ public static DataTable buildEmptyDataTable(QueryContext 
queryContext)
     }
   }
 
+  public static DataTable buildMetadataOnlyDataTable(DataTable origDataTable) {

Review comment:
       I feel we might better handle this in the table table, instead of 
replicating all the metadata keys. Handling it this way can add maintenance 
overhead




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