if ($query eq $hash{'query'}){
        push @{$hash{$query}},{'domain' => $domain ,'count' => $count};
        $tot_count += $count;
}
else{
        my $qid = $hash{'query'};
        .... some operations

        %hash=();
        $hash{'query'}= $query;
        push @{$hash{$query}},{'domain' => $domain ,'count' => $count};
        $tot_count = $count;
}