[ntuple] Support multiple column representations in the merger#22017

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silverweed wants to merge 17 commits into

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silverweed:ntuple_merge_colrep2

Commits on Jun 17, 2026

[ntuple] Fix RFieldFundamental::GenerateColumns using the wrong repr idx
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[ntuple] Small improvement in RNTupleMerger
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[ntuple] Serializer: sort columns by ID before serializing them
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[ntuple] update merger test to make sure we test nRepetitions
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[ntuple] Clarify a bit RFieldBase::EntryToColumnElementIndex
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[ntuple] Allow adding duplicate column representations
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[ntuple] Add RClusterDescriptor::TryGetColumnRange
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[ntuple] Introduce feature flag 0 (nested deferred columns)
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[ntuple] Add functionality to RPagePersistentSink for column extension
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[ntuple] Add multiple column representation support in the Merger
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[ntuple] Merger: extract column repr matching into a separate function
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[ntuple] Merger: accept different sizes for fields' logical column ids
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[ntuple] Add new merger test
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[ntuple] support merging columns with metadata (with different types)
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[ntuple] Support merging columns with same type and different metadata
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[ntuple][NFC] update Merging.md
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[ntuple] ensure valid descriptor in AddAliasColumn/AddColumnRepresentation
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