Module aggregation 

Aggregation support for backward chaining queries

Provides aggregate functions like COUNT, SUM, AVG, MIN, MAX for use in backward chaining queries.

Example

use rust_rule_engine::backward::*;

let mut engine = BackwardEngine::new(kb);

// Count all employees
let count = engine.query_aggregate(
    "count(?x) WHERE employee(?x)",
    &mut facts
)?;

// Sum of all salaries
let total = engine.query_aggregate(
    "sum(?salary) WHERE salary(?name, ?salary)",
    &mut facts
)?;

// Average salary
let avg = engine.query_aggregate(
    "avg(?salary) WHERE salary(?name, ?salary) AND ?salary > 50000",
    &mut facts
)?;

Structs

AggregateQuery

Parsed aggregate query

Enums

AggregateFunction

Aggregate function types

Functions

apply_aggregate

Apply aggregate function to solutions

parse_aggregate_query

Parse an aggregate query string