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datalog: magic-sets benefit test on disjoint-cluster graph (205/205)
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Two disjoint chains, query rooted in cluster 1. Semi-naive
derives the full closure over both clusters (6 ancestor tuples).
Magic-sets only seeds magic_ancestor^bf for cluster 1, so only
2 query-relevant tuples are returned (a→b, a→c). The test
asserts both numbers, demonstrating the actual perf-shape
benefit of goal-directed evaluation.
This commit is contained in:
giles
2026-05-08 10:03:04 +00:00
parent a53e47b415
commit 57a1dbb232
3 changed files with 29 additions and 6 deletions
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4
lib/datalog/scoreboard.md
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@@ -1,6 +1,6 @@
# datalog scoreboard
**204 / 204 passing** (0 failure(s)).
**205 / 205 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 | 20 | 20 | ok |
| magic | 21 | 21 | ok |
| demo | 18 | 18 | ok |