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if(!exists $result{$uniqueKey}) # If this combinaison is unknown
   {
...
   {
     push @{ $result{$uniqueKey} }, \%currentRow; # add the current ro
+w to the existing ones
   }

c:\@Work\Perl\monks>perl -wMstrict -le
"use Data::Dump;
...
["foo", "A", "bar", "W", "bar", "X", "foo", "B", "bar", "Y"]

{ bar => ["W", "X", "Y"], foo => ["A", "B"] }