tarun11Mavani commented on code in PR #19040:
URL: https://github.com/apache/pinot/pull/19040#discussion_r3664217154


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/openstruct/MutableOpenStructDataSource.java:
##########
@@ -62,10 +63,13 @@ public ComplexFieldSpec getFieldSpec() {
   @Override
   @Nullable
   public DataSource getDataSource(String key) {
-    Map<IndexType, IndexReader> indexes = _index.getIndexes(key);
-    if (indexes == null || indexes.isEmpty()) {
+    MutableKeyColumn col = _index.getKeyColumn(key);
+    if (col == null) {
       return null;
     }
+    Map<IndexType, IndexReader> indexes = new 
HashMap<>(_index.getIndexes(key));

Review Comment:
   make sense. Adding `_perKeyDataSources` cache here. 



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