bziobrowski commented on code in PR #15591:
URL: https://github.com/apache/pinot/pull/15591#discussion_r2050691351


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/column/PhysicalColumnIndexContainer.java:
##########
@@ -39,7 +39,11 @@
 public final class PhysicalColumnIndexContainer implements 
ColumnIndexContainer {
   private static final Logger LOGGER = 
LoggerFactory.getLogger(PhysicalColumnIndexContainer.class);
 
-  private final Map<IndexType, IndexReader> _readersByIndex;
+  private static final IndexReader[] EMPTY_READERS = new IndexReader[0];
+

Review Comment:
   This change should reduce average memory size from 300B+ to ~60B. 



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