# make a new $rs selecting only the PKs (that's all we really need for the subq)
delete @{$attrs}{qw/collapse select _prefetch_selector_range as/};
$attrs->{columns} = [ map { "$attrs->{alias}.$_" } @$idcols ];
- $attrs->{group_by} = []; # FIXME - this is an evil hack, it causes the optimiser to kick in and throw away the LEFT joins
+ #$attrs->{group_by} = []; # FIXME - this is an evil hack, it causes the optimiser to kick in and throw away the LEFT joins
my $subrs = (ref $self)->new($rsrc, $attrs);
if (@$idcols == 1) {