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    sub _select_fields
    {
        my $self = shift;
...
        push @fields, 'num_theaters', 'day_multiple';
        return @fields;
    }

    sub _select_fields
    {
        my $self = shift;
...
        $rev_type    = 'both' unless exists $rev_types{$rev_type};
        return @{$rev_types{$rev_type}};
    }