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[ntuple] Add slow merging strategy - #23739
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silverweed merged 5 commits intoOct 26, 2026
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Test Results 24 files 24 suites 4d 3h 8m 21s ⏱️ Results for commit d5f8107. ♻️ This comment has been updated with latest results. |
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Otherwise it'll gonna reuse the already-initialized source, which works but it doesn't test the intended code path
For future use by the Merger
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This PR adds preliminary support for L4 ("slow") merging in the RNTupleMerger.
It does so by adding a new MergeStrategy that implements the slow merging flow. This is not yet enabled in any case by this PR but it will be used by attribute merging in a later PR.
I tested as much as I could this new flow and it works for most cases (the test failures that one would have by setting
doSlowMerge = trueare almost entirely due to test expectations that don't hold for slow merging).Proper testing will be added when slow merging is enabled in the future, but for 6.42 it'll only be used by attributes, and they will get proper tests.