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New lib/datalog/aggregates.sx: (count R V Goal), (sum R V Goal), (min R V Goal), (max R V Goal). dl-eval-aggregate runs dl-find-bindings on the goal under the outer subst, collects distinct values of V, applies the operator, binds R. Empty input: count/sum return 0; min/max produce no binding (rule fails). Group-by emerges naturally from outer-subst substitution into the goal — `popular(P) :- post(P), count(N, U, liked(U, P)), >=(N, 3).` counts per-post. Stratifier extended: dl-aggregate-dep-edge contributes a negation-like edge so the aggregate's goal relation is fully derived before the aggregate fires (non-monotonicity respected). Safety relaxed for aggregates: goal-internal vars are existentials, only the result var becomes bound.
18 lines
610 B
JSON
18 lines
610 B
JSON
{
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"lang": "datalog",
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"total_passed": 134,
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"total_failed": 0,
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"total": 134,
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"suites": [
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{"name":"tokenize","passed":26,"failed":0,"total":26},
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{"name":"parse","passed":18,"failed":0,"total":18},
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{"name":"unify","passed":28,"failed":0,"total":28},
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{"name":"eval","passed":15,"failed":0,"total":15},
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{"name":"builtins","passed":19,"failed":0,"total":19},
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{"name":"semi_naive","passed":8,"failed":0,"total":8},
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{"name":"negation","passed":10,"failed":0,"total":10},
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{"name":"aggregates","passed":10,"failed":0,"total":10}
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],
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"generated": "2026-05-08T08:28:29+00:00"
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}
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