gianm commented on code in PR #19375:
URL: https://github.com/apache/druid/pull/19375#discussion_r3143006039


##########
processing/src/main/java/org/apache/druid/data/input/impl/AggregateProjectionSpec.java:
##########
@@ -102,6 +103,9 @@ public AggregateProjectionSpec(
     if (name == null || name.isEmpty()) {
       throw InvalidInput.exception("projection name cannot be null or empty");
     }
+    if (Projections.BASE_TABLE_PROJECTION_NAME.equals(name)) {

Review Comment:
   Might as well reserve all names starting with `__`, just in case we need 
another one later.



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