I want implementation ongroup in power query M language

Question

I want implementation ongroup in power query M language.
in tutorial plese let see this link
https://learn.microsoft.com/en-us/power-query/handlingqueryfolding .

I have big data in server Side,
I need create connector for power bi by power query ,
to dynamically generate queries at runtime without pre-caching the user's data model.
I need implementation Ongroup (Expression Handlers) but not have any Example.

plese help me.

Answer 1

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