unless( $cols{$select} ) {
carp_unique(
'Use of distinct => 1 while selecting anything other than a column '
- . 'declared on the primary ResultSource is deprecated - please supply '
- . 'an explicit group_by instead'
+ . 'declared on the primary ResultSource is deprecated (you selected '
+ . "'$self->{_as}') - please supply an explicit group_by instead"
);
# collapse the selector to a literal so that it survives the distinct parse