snuyanzin commented on PR #24156:
URL: https://github.com/apache/flink/pull/24156#issuecomment-1925707087

   I wonder why the implementation doesn't follow new stack implememntation 
approach like e.g. 
`org.apache.flink.table.runtime.functions.scalar.CoalesceFunction`, 
`org.apache.flink.table.runtime.functions.scalar.IfNullFunction` and others 
inheriting 
`org.apache.flink.table.runtime.functions.scalar.BuiltInScalarFunction`
   ?


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