Jackie-Jiang commented on code in PR #11015:
URL: https://github.com/apache/pinot/pull/11015#discussion_r1248573641


##########
pinot-common/src/main/java/org/apache/pinot/common/datablock/BaseDataBlock.java:
##########
@@ -387,7 +387,10 @@ public RoaringBitmap getNullRowIds(int colId) {
    */
   protected byte[] serializeStringDictionary()
       throws IOException {
-    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+    if (_stringDictionary.length == 0) {
+      return new byte[]{0, 0, 0, 0};

Review Comment:
   (minor) Equivalent to `new byte[4]`? Same for other places



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