raminqaf commented on code in PR #27901:
URL: https://github.com/apache/flink/pull/27901#discussion_r3063822431


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flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/BuiltInFunctionDefinition.java:
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Review Comment:
   I tried this but, implementing `ChangelogFunction` on 
`BuiltInFunctionDefinition` can't give us dynamic changelog mode based on 
(input) arguments, because `ChangelogContext` only provides input changelog 
modes and downstream requirements and not the function's arguments like 
`op_mapping`. 
   
   We need the `CallContext` to inspect the inputs (i.e., from `op_mapping`), 
which is what the resolver provides.



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