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datalog: magic-vs-semi work-shape test on chain-12 (209/209)
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Demonstrates the practical effect of goal-directed evaluation:
chain of 12 nodes, semi-naive derives the full ancestor closure
(78 = 12·13/2 tuples), while a magic-rooted query at node 0
returns only its 12 descendants. Concrete check that magic
limits derivation to the query's transitive cone.
This commit is contained in:
giles
2026-05-08 10:13:13 +00:00
parent 4a643a5c52
commit 43fa31375d
3 changed files with 35 additions and 6 deletions
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8
lib/datalog/scoreboard.json
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@@ -1,8 +1,8 @@
{
"lang": "datalog",
"total_passed": 208,
"total_passed": 209,
"total_failed": 0,
"total": 208,
"total": 209,
"suites": [
{"name":"tokenize","passed":26,"failed":0,"total":26},
{"name":"parse","passed":18,"failed":0,"total":18},
@@ -13,8 +13,8 @@
{"name":"negation","passed":10,"failed":0,"total":10},
{"name":"aggregates","passed":18,"failed":0,"total":18},
{"name":"api","passed":17,"failed":0,"total":17},
{"name":"magic","passed":21,"failed":0,"total":21},
{"name":"magic","passed":22,"failed":0,"total":22},
{"name":"demo","passed":18,"failed":0,"total":18}
],
"generated": "2026-05-08T10:06:36+00:00"
"generated": "2026-05-08T10:13:00+00:00"
}