Function fold_and_simplify

datafusion/core/tests/expr_api/simplification.rs:175–186

()

#[test]
fn fold_and_simplify() {
    let context = SimplifyContext::builder().with_schema(schema()).build();

    // What will it do with the expression `concat('foo', 'bar') == 'foobar')`?
    let expr = concat(vec![lit("foo"), lit("bar")]).eq(lit("foobar"));

    // Since datafusion applies both simplification *and* rewriting
    // some expressions can be entirely simplified
    let simplifier = ExprSimplifier::new(context);
    let simplified = simplifier.simplify(expr).unwrap();
    assert_eq!(simplified, lit(true))
}

#[test]
/// Ensure that timestamp expressions are folded so they aren't invoked on each row