Query/Perf: don't compile liftable constant resolvers in interpretation mode when the resolver itself contains a lambda

[maumar]

This is part of a bigger perf regression between EF8 and EF9: #35053

When processing LiftableConstantExpressions in the regular (non-AOT) mode we compile the resolver lambda and then evaluate it to get back the actual constant we plan to use. We do the compilation in the interpretation mode and that causes problems if the resulting object is itself (or contains) a delegate. Compiling into a delegate using interpreted mode, has impact on allocations as well as execution speed.

before the fix (this already includes the invoke fix #35206)

Method	Async	Mean	Error	StdDev	Op/s	Gen0	Gen1	Allocated
MultiInclue	False	487.1 ms	0.99 ms	0.88 ms	2.053	17000.0000	11000.0000	103.29 MB
MultiInclue	True	487.4 ms	3.63 ms	3.22 ms	2.052	17000.0000	11000.0000	103.29 MB

after the fix

Method	Async	Mean	Error	StdDev	Op/s	Gen0	Gen1	Allocated
MultiInclue	False	455.1 ms	8.94 ms	10.29 ms	2.197	11000.0000	6000.0000	67.92 MB
MultiInclue	True	435.4 ms	1.77 ms	1.66 ms	2.297	11000.0000	6000.0000	67.92 MB

[maumar]

smoking gun benchmark:

    internal class Program
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run(args, typeof(Program).Assembly);
        }
    }

    public static class BenchmarkRunner
    {
        public static void Run(string[] args, Assembly assembly, IConfig config = null)
        {
            config ??= DefaultConfig.Instance;

            config = config
                .AddDiagnoser(MemoryDiagnoser.Default)
                .AddColumn(StatisticColumn.OperationsPerSecond);

            BenchmarkSwitcher.FromAssembly(assembly).Run(args, config);
        }
    }

    public class InterpretationBenchmark
    {
        private Expression<Func<object, Func<object?, object?, bool>[]>> _expression;
        private Func<object, object, bool>[] _compiled;
        private Func<object, object, bool>[] _compiledInterpreted;

        [GlobalSetup]
        public virtual void Initialize()
        {
            var left = Expression.Parameter(typeof(object), "left");
            var right = Expression.Parameter(typeof(object), "right");

            var prm = Expression.Parameter(typeof(object));
            _expression = Expression.Lambda<Func<object, Func<object?, object?, bool>[]>>(
                Expression.NewArrayInit(
                    typeof(Func<object, object, bool>),
                    Expression.Lambda<Func<object?, object?, bool>>(
                        Expression.Condition(
                            Expression.Equal(left, Expression.Constant(null)),
                            Expression.Equal(right, Expression.Constant(null)),
                            Expression.AndAlso(
                                Expression.NotEqual(right, Expression.Constant(null)),
                                Expression.Equal(
                                    Expression.Convert(left, typeof(int)),
                                    Expression.Convert(left, typeof(int))))),
                      left,
                      right)), prm);

            _compiled = _expression.Compile()("_");
            _compiledInterpreted = _expression.Compile(preferInterpretation: true)("_");
        }

        [Benchmark]
        public virtual void Compiled()
        {
            var equal = 0;
            for (var i = 0; i < 100; i++)
            {
                for (var j = 0; j < 100; j++)
                {
                    if (_compiled[0](i, j))
                    {
                        equal++;
                    }
                }
            }
        }

        [Benchmark]
        public virtual void CompiledInterpolated()
        {
            var equal = 0;
            for (var i = 0; i < 100; i++)
            {
                for (var j = 0; j < 100; j++)
                {
                    if (_compiledInterpreted[0](i, j))
                    {
                        equal++;
                    }
                }
            }
        }
    }

results:

Method	Mean	Error	StdDev	Op/s	Gen0	Allocated
Compiled	65.69 us	0.706 us	0.660 us	15,223.4	76.4160	468.75 KB
CompiledInterpolated	930.20 us	7.046 us	6.591 us	1,075.0	433.5938	2656.25 KB

[maumar]

reopening for potential patch

[maumar]

fixed for 9.0.1 - b50581a