mgaido91 commented on a change in pull request #3633: NIFI-6523 MergeRecords 
properties should accept expression language variables
URL: https://github.com/apache/nifi/pull/3633#discussion_r310456876
 
 

 ##########
 File path: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/MergeRecord.java
 ##########
 @@ -151,7 +153,7 @@
         .description("If specified, two FlowFiles will be binned together only 
if they have the same value for "
             + "this Attribute. If not specified, FlowFiles are bundled by the 
order in which they are pulled from the queue.")
         .required(false)
-        .expressionLanguageSupported(ExpressionLanguageScope.NONE)
+        
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
 
 Review comment:
   does it make any sense to change this on a flowfile level? I see no 
reason/use case for this

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