Function optimize_by_cost 

pub fn optimize_by_cost(
    expr: &TLExpr,
    context: &CompilerContext,
) -> (TLExpr, CostBasedStats)

Optimize an expression using cost-based optimization.

This function explores equivalent rewrites and selects the lowest-cost alternative based on estimated execution cost.

Example

use tensorlogic_compiler::optimize::optimize_by_cost;
use tensorlogic_compiler::CompilerContext;
use tensorlogic_ir::{TLExpr, Term};

let mut ctx = CompilerContext::new();
ctx.add_domain("Person", 1000);

let expr = TLExpr::and(
    TLExpr::pred("expensive", vec![Term::var("x")]),
    TLExpr::pred("cheap", vec![Term::var("x")]),
);

let (optimized, stats) = optimize_by_cost(&expr, &ctx);
assert!(stats.alternatives_explored > 0);