[skip-ci][ntuple] add SoA design document - #23202
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| For the SoA vectors, the `ROOT::RVec` type is used because it can own or adopt memory. | ||
| As a result, optimized code can prepare a memory region and initialize an `RVec` with that region and the right length | ||
| in order to directly read into adopted memory. | ||
| SoA fields can also be read without any additional logic, in which case the `RVec`s own their memory. |
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While reading through the document I thought it would have been helpful to also have small snippets exemplifying the reading and writing of a SoA type, perhaps including also the case with the preparation of the memory region. Is it missing or out of scope for this document?
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I think this is rather for the tutorial (which exists) than for this document.
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Part of #19230
This should be merged once the first complete version of the code is ready. Submitted as a preview PR.