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find all tickets where:


        CF Foo 
                Has values (talk or read) AND
                Has values (bar and baz) AND 
                doesn't have values (bing or bong) 


LimitCustomFieldValues {
        my %args = ( CustomField => undef, 
                     ClauseId => 'CustomFields',
                     OPERATOR => undef,
                     ENTRYAGGREGATOR => undef,
                     VALUES => undef,
                     @_) ;

        unless ( $self->{'TicketAliases'}{$args{'ClauseId'}}{'CustomField'} ) {
        $self->{'TicketAliases'}{$args{'ClauseId'}}{'CustomField'} = $self->NewAlias('CustomFields');
        $self->Join(TABLE1 =>$self->{'TicketAliases'}{$args{'ClauseId'}}{'CustomField' },  
                    FIELD1 => 'QueueId',
                    TABLE2 => 'main', FIELD2 => 'QueueId');

        if ($args{'OPERATOR'} =~ /!=|IS/i) {
        }
        else {
        }

}
        # {{{ if it's a keyword
        elsif ( $TYPES{ $restriction->{'FIELD'} } eq 'CUSTOMFIELD' ) {

            my $null_columns_ok;
            my $TicketCFs = $self->Join( TYPE   => 'left',
                                                ALIAS1 => 'main',
                                                FIELD1 => 'id',
                                                TABLE2 => 'TicketCustomFieldValues',
                                                FIELD2 => 'Ticket' );

            foreach my $value ( @{ $restriction->{'VALUES'} } ) {
                $self->SUPER::Limit( ALIAS      => $TicketCFs,
                                     FIELD      => 'Content',
                                     OPERATOR   => $restriction->{'OPERATOR'},
                                     VALUE      => $value,
                                     QUOTEVALUE => $restriction->{'QUOTEVALUE'},
                                     ENTRYAGGREGATOR => 'AND', );
            }
            if (    ( $restriction->{'OPERATOR'} =~ /^IS$/i ) or ( $restriction->{'OPERATOR'} eq '!=' ) ) {
                $null_columns_ok = 1;
            }

            #If we're trying to find tickets where the keyword isn't somethng, also check ones where it _IS_ null
            if ( $restriction->{'OPERATOR'} eq '!=' ) {
                $self->SUPER::Limit( ALIAS           => $TicketCFs,
                                     FIELD           => 'Content',
                                     OPERATOR        => 'IS',
                                     VALUE           => 'NULL',
                                     QUOTEVALUE      => 0,
                                     ENTRYAGGREGATOR => 'OR', );
            }

            $self->SUPER::Limit( LEFTJOIN => $TicketCFs,
                                 FIELD    => 'CustomField',
                                 VALUE    => $restriction->{'CUSTOMFIELD'},
                                 ENTRYAGGREGATOR => 'OR' );

        }

        # }}}

    }