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    my %big_hash;
    my $field_name1 = "field_name1";
...
    $big_hash{$key}{$field_name1}
    $big_hash{$key}{$field_name2}
    ...

    my %field_name1;
    my %field_name2;
    ...
    $field_name1{$key}
    $field_name2{$key}