chenboat commented on a change in pull request #5444:
URL: https://github.com/apache/incubator-pinot/pull/5444#discussion_r431604976



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/common/BlockSingleValIterator.java
##########
@@ -18,37 +18,17 @@
  */
 package org.apache.pinot.core.common;
 
-/**
- *
- * TODO: Split into two classes, one for iterator over data, another over 
dictionary id's.
- */
-public abstract class BlockSingleValIterator implements BlockValIterator {
-
-  char nextCharVal() {
-    throw new UnsupportedOperationException();
-  }
+public interface BlockSingleValIterator extends BlockValIterator {

Review comment:
       javadoc




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