I've also moved the column matching - finding which rows of the attstats result set match to which columns in the local table - up into the fetch portion, something you had mentioned wanting to see as well. This resulted in some significant refactoring, but overall I think you will find the changes for the better.
I've added a reset of the result set indexes. Probably not necessary given that we only keep the result set if all the columns found homes, but good for peace of mind.
