[Dbix-class] '+select'/'+as' is broken when chaining resultsets

[Peter Rabbitson]

BUCHMULLER Norbert wrote:
> I just suspect that
> my thread was ignored by accident.
> 

Indeed it was. The functionality patch looks good in itself. However I
am not sure that the tests changes are appropriate. The test name is
88result_set_column which implies calling methods on a resultset. Yet
you changed a number of $rs->accessor invocations to
$rs->first->accessor. Please explain why you did this.