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A "mixed" relation has both user-asserted facts AND rules with the
same head. Previously dl-retract! wiped every rule-head relation
wholesale before re-saturating — the saturator only re-derives the
IDB portion, so explicit EDB facts vanished even for a no-op retract
of a non-existent tuple. Repro:
(let ((db (dl-program "p(a). p(b). p(X) :- q(X). q(c).")))
(dl-retract! db (quote (p z)))
(dl-query db (quote (p X))))
went from {a, b, c} to just {c}.
Fix: track :edb-keys provenance in the db.
- dl-make-db now allocates an :edb-keys dict.
- dl-add-fact! (public) marks (rel-key, tuple-key) in :edb-keys.
- New internal dl-add-derived! does the append without marking.
- Saturator (semi-naive + naive driver) now calls dl-add-derived!.
- dl-retract! strips only the IDB-derived portion of rule-head
relations (anything not in :edb-keys) and preserves the EDB
portion through the re-saturate pass.
2 new regression tests; conformance 262/262.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
21 lines
775 B
JSON
21 lines
775 B
JSON
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"lang": "datalog",
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"total_passed": 262,
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"total": 262,
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"suites": [
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"generated": "2026-05-11T07:50:41+00:00"
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}
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