bziobrowski commented on code in PR #15591:
URL: https://github.com/apache/pinot/pull/15591#discussion_r2097308105


##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/metadata/ColumnMetadataImpl.java:
##########
@@ -355,7 +415,9 @@ public static class Builder {
     private PartitionFunction _partitionFunction;
     private Set<Integer> _partitions;
     private boolean _autoGenerated;
-    private Map<IndexType<?, ?, ?>, Long> _indexSizeMap = new HashMap<>();
+
+    // use non-default size to save space for most columns
+    LongArrayList _indexSizeList = new LongArrayList(2);

Review Comment:
   Done. 



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