Documentation on bitmap for RDataFrame Snapshot with variations



Hello all. When saving an RDF Snapshot with variations, there’s a “bitmask for each event, indicating which variations are valid”.

Unfortunately, it’s not really documented anywhere how the bitmask maps to the nominal and the different variations. I think it’d be an important addition to the documentation in case users need to check this manually.

Thank you !

Welcome to the ROOT forum!
Let’s invite @vpadulan

Hello,

you are right! It wasn’t documented in detail because the feature is still experimental, but that shouldn’t stop us from writing down how it works currently.

Some more details are already in the works:

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Dear @rcoelhob ,

Could you let us know if you find the updated documentation good enough? Ideally, by commenting directly in the linked PR Add more docs to the Snapshot with variations section by vepadulano · Pull Request #20402 · root-project/root · GitHub .

Thank you!

Vincenzo

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