Jackie-Jiang commented on code in PR #15526:
URL: https://github.com/apache/pinot/pull/15526#discussion_r2074190878


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/loader/ForwardIndexHandler.java:
##########
@@ -411,7 +412,8 @@ private boolean shouldChangeDictIdCompressionType(String 
column, SegmentDirector
     // The compression type for an existing segment can only be determined by 
reading the forward index header.
     ColumnMetadata existingColMetadata = 
_segmentDirectory.getSegmentMetadata().getColumnMetadataFor(column);
     DictIdCompressionType existingCompressionType;
-    try (ForwardIndexReader<?> fwdIndexReader = 
ForwardIndexType.read(segmentReader, existingColMetadata)) {
+    try (ForwardIndexReader<?> fwdIndexReader = 
ForwardIndexType.read(segmentReader, _fieldIndexConfigs.get(column),

Review Comment:
   I don't follow. Can you provide more context?



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