${$partition_h{a}}{full_tabname}

Do you really mean  ${$partition_h{a}}{full_tabname} and not  ${$partition_h{$a}}{full_tabname} (a vice $a)?

Update: It is possible (though usually very tedious) to put debug statements into a sort block as long as the comparison is the last expression evaluated:

c:\@Work\Perl\monks>perl -wMstrict -e
"use Data::Dump qw(dd);
 ;;
 my @sorted = sort { dd $a, $b;  $a cmp $b; } (qw(d a c e b), undef);
 dd \@sorted;
"
("d", "a")
("c", "e")
("b", undef)
Use of uninitialized value in string comparison (cmp) at -e line 1.
("a", "c")
("c", "d")
("d", "e")
("a", undef)
Use of uninitialized value in string comparison (cmp) at -e line 1.
("a", "b")
("c", "b")
[undef, "a", "b", "c", "d", "e"]
[download]

(Update: Changed example code to use Data::Dump::dd() instead of print and to include an undef element in the list to be sorted.)

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