Support for IQueryable<TEntity> as data source for UpsertRange<TEntity>?

I am faced with a scenario where it would be super desireable to be able to pass an IQueryable<TEntity> to UpsertRange<TEntity> instead of an IEnumerable<TEntity> or TEntity[].

This should then result in the UPSERT being run entirely on the DB side as opposed to loading entities into memory. I.e.:

var someSourceEntitiesProjectionToDailyVisits = dataContext.SomeSourceEntities
    .Where(x => x.SomeSourceEntityProperty == someValue)
    .Select(x => new {
        UserID = x.SomeFieldMatchedToUserId,
        Date = DateTime.UtcNow.Date
    });

dataContext.DailyVisits
    .UpsertRange(someSourceEntitiesProjectionToDailyVisits)
    .On(v => new { v.UserID, v.Date })
    .WhenMatched(v => new DailyVisit
    {
        Visits = v.Visits + 1,
    })
    .RunAsync();

Is something like this on the roadmap?

[APIWT]

Okay, this totally makes sense to me now. It is similar to the INSERT INTO … SELECT … ON DUPLICATE KEY UPDATE pattern that I grew to love in MySQL. I am not sure what it will take to implement something like this so I’ll let @artiomchi take it from here. Sorry I could not be more helpful 😦

[artiomchi]

Going to close this issue due to inactivity. Also, as explained above - this is too much outside the scope of this project