Migration from BLToolkit: Where is update batch?

Where can I find the following method in Linq2db? Is replacement not implemented?

I want to get bulk update of all fields of all items in collection.

public static int Update<T>(this DbManager dataContext, int maxBatchSize, IEnumerable<T> list)
{
    return new SqlQuery<T>(dataContext).Update(dataContext, maxBatchSize, list);
}

[MaceWindu]

Yes, this is a limitation of current Merge API we have and unfortunately it is not possible to disable insert operation without changes to linq2db source code. This will be fixed in new Merge API I am currently working on and expect to release preview version in a couple of weeks.

[MaceWindu]

@hardhub for now (next week or two) I will work solely only on merge support for RDBMS that supports MERGE INTO command. After I will finish with it, I will see what we can do for RDBMS that support UPSERT commands to support them in Merge API.

If you are interested, you can try to build linq2db from this branch: https://github.com/MaceWindu/linq2db/tree/merge_improvements

Note that it will work only with SQL Server for now as I want to test all required functionality on one provider and then tune support for others.