package Schema::DB::Constraint::Index;
use strict;
use Common;
use parent qw(Schema::DB::Constraint);

sub CTOR {
    my $this = shift;
    $this->SUPER::CTOR(@_);
    
    my %colnames;
    not grep { $colnames{$_}++ } $this->Columns or die new Exception('Each column in the index can occur only once');
}

1;