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datalog: dl-magic-query driver (204/204)
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End-to-end magic-sets entry point. Given (db, query-goal):
  - copies the caller's EDB facts (relations not headed by any
    rule) into a fresh internal db
  - adds the magic seed fact
  - adds the rewritten rules
  - saturates and runs the query
  - returns the substitution list

Caller's db is untouched. Equivalent to dl-query for any
fully-stratifiable program; intended as a perf alternative on
goal-shaped queries against large recursive relations.

2 new tests: equivalence to dl-query on chain-3 ancestor, and
non-mutation of the caller's db (rules count unchanged).
This commit is contained in:
giles
2026-05-08 10:00:44 +00:00
parent a080ce656c
commit a53e47b415
5 changed files with 110 additions and 10 deletions
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4
lib/datalog/scoreboard.md
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@@ -1,6 +1,6 @@
# datalog scoreboard
**202 / 202 passing** (0 failure(s)).
**204 / 204 passing** (0 failure(s)).
| Suite | Passed | Total | Status |
|-------|--------|-------|--------|
@@ -13,5 +13,5 @@
| negation | 10 | 10 | ok |
| aggregates | 18 | 18 | ok |
| api | 14 | 14 | ok |
| magic | 18 | 18 | ok |
| magic | 20 | 20 | ok |
| demo | 18 | 18 | ok |