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my @output;
my $pk = "SomeString";
...
@output = uniq @output;
#At this point @output is empty
return \@output;

Same loop to generation to generate the arrays. Still seeing all value
+s in the array before this:
   my @final_output;
...
my @output_array = keys %output_hash;

return \@output_array;

my %output_hash;
my $pk = "SomeString";
...
my @output_array = keys %output_hash;

return \@output_array;

<PoolName>: 4737 lines returned.
'SomeString'
...
SomeString, HASH(0x106d978)
Bad command return: <Some command used to get this data>
Use of uninitialized value in concatenation (.) or string at <script_p
+ath> line <Line with print "HERE: " .$row->{"$pk"} . "\n";>.