leventov commented on a change in pull request #8059: Refactoring to use
`CollectionUtils.mapValues`
URL: https://github.com/apache/incubator-druid/pull/8059#discussion_r303460815
##########
File path: core/src/main/java/org/apache/druid/utils/CollectionUtils.java
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@@ -88,12 +89,22 @@ public int size()
/**
* Returns a transformed map from the given input map where the key is
modified based on the given keyMapper
- * function.
+ * function. This method fails if keys collide after applying the given
keyMapper function and
+ * throws a IllegalStateException.
+ *
+ * @throws ISE if key collisions occur while applying specified keyMapper
*/
+
Review comment:
Extra line
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