jacques-n commented on pull request #2603:
URL: https://github.com/apache/calcite/pull/2603#issuecomment-977206223


   > Just wondering, does it have something in common with 
https://github.com/forax/exotic#structuralcall---javadoc ?
   
   Similar, but not the same. Here we're using LambdaMetafactory and actually 
convert the function call to a generic version. Core of that work is 
[here](https://github.com/apache/calcite/blob/b69ffa2c0eeb65b1bb5c46d745730cdace4d5e4c/core/src/main/java/org/apache/calcite/rel/metadata/lambda/ReflectionToLambdaProvider.java#L260).


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