Don't select unnecessary columns

bool b = false;
var q = from t in db.Tbl1
        select new
        {
            t.C1,
            Other = b ? new { t.C2, t.C3, t.C4 } : null
        };

The SQL executed is:

SELECT
        [t].[C1],
        [t].[C2],
        [t].[C3],
        [t].[C4]
FROM
        [Tbl1] [t]

The property Other in the results is null. But it loads the columns C2, C3 and C4 from the DB. Desired behavior: don’t load columns which aren’t needed.

[sdanyliv]

This optimisation is not supported. Currently we do not optimise expression tree based on parameters. Will take a look, probably it makes sense to do that for conditional expression.

[sdanyliv]

I see, forgot to check this cache variant. Here we cache plan by reference. Thanks for mentioned that.