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Builds and runs the small repro specified in
.context/experiments/stable-row-id-compaction.md §5 ("Small repro plan")
and extends the writeup with the empirical Phase 1 evidence (F7–F11).
Matrix {BTree, Bitmap, LabelList} × {stable=true, stable=false}, 6 fragments
forced via small max_rows_per_file and target_rows_per_fragment, with
with_row_id() probes pre- and post-compaction. All six cases return correct
counts; with enable_stable_row_ids: true the row IDs round-trip unchanged
across compaction; with the flag off the row addresses move (fragment_id <<
32 | local_row), which is the documented contract.
Plus a side experiment confirming that Operation::Overwrite (both staged
via InsertBuilder::execute_uncommitted + CommitBuilder::execute and direct
Dataset::write Overwrite) inherits manifest.uses_stable_row_ids from the
existing dataset, even when the WriteParams flag is absent. This resolves
the suspicion about table_store.rs:956 (stage_overwrite path not setting
the flag): the path is correct, not a latent bug.
Conclusion: MR-737 §5.5 substrate caveat ("Stable Row ID for Index is
documented as experimental in lance-4.0.x") is empirically resolved.
Feature works; docs are conservative. RFC shape for MR-927 is a docs-PR.
Refs MR-925, MR-927.
Co-Authored-By: Ragnor Comerford <ragnor.comerford@gmail.com>
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| experiments | ||
| research | ||
| scratch/merge-insert-cas-repro | ||
| merge-insert-cas-granularity.md | ||