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key_column_index_coverage checked BTREE-exists + physical_rows but not that the index actually covers the current fragments. Since edge-index creation is skipped once a BTREE exists, fragments appended later stay unindexed while coverage still reported Indexed — so the cost chooser priced a partly-full scan as fully indexed. Compare the BTREE's fragment_bitmap (public on lance_table IndexMetadata) against the dataset's current fragment ids; report Degraded when any are uncovered. A None bitmap means Lance can't report coverage — don't over-degrade. Results are unaffected (the scan returns unindexed-fragment rows either way); this corrects the cost signal. Test: a freshly-loaded edge BTREE is Indexed; after appending an edge the new fragment is uncovered → Degraded. Surface guard pins IndexMetadata.fragment_bitmap. |
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| omnigraph | ||
| omnigraph-cli | ||
| omnigraph-compiler | ||
| omnigraph-policy | ||
| omnigraph-server | ||