I could not figure this out because fetchrow_hashref must be written in
C and not Perl and also I didn't see it documented. I want to know if
fetchrow_hashref calls fetchrow_arrayref and then creates a hashref from
this and $sth->{NAMES} somehow.
In other words, if I have no special refinements of the core DBI
fetchrow_hashref, can I simply implement fetch(), fetchrow_arrayref
{ goto &fetch } and simply let DBI implement fetchrow_hashref as normal.
