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[ntuple] add support for attribute merging - #23808
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Test Results 23 files 23 suites 3d 21h 19m 32s ⏱️ Results for commit 4ccd8e7. ♻️ This comment has been updated with latest results. |
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LGTM, as discussed, the model extension of subfields should be restricted to the attributes user-defined model's root field.
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This makes it easier to manage models' lifetime especially when attributes are added to the picture.
This is required to support union-merging of attribute fields.
They cannot be read back at the moment. We might support them in the future
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Depends on #23739.
Adds support for RNTupleAttributes merging via custom MergeActions + slow merging.