Jackie-Jiang commented on code in PR #14479:
URL: https://github.com/apache/pinot/pull/14479#discussion_r1848784907


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/indexsegment/mutable/MutableSegmentImpl.java:
##########
@@ -797,6 +801,18 @@ private void addNewRow(int docId, GenericRow row) {
             recordIndexingError(indexEntry.getKey(), e);
           }
         }
+
+        if (_thresholdForNumOfColValuesEnabled) {
+          int prevCount = indexContainer._valuesInfo.getNumValues();
+          long newCount = prevCount + 1L + values.length;

Review Comment:
   Essentially what we want to ensure is that whatever accepted in mutable 
segment won't cause problem when the mutable segment is sealed.
   I'm okay if we only limit total values here, but we need to enhance 
immutable index so that it can hold 2B values regardless of the bit length per 
value.



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