Hello, I have a query which returns a set of rows. Each row has an id field:

$VAR1 = [
          {
            'amount' => '58.80',
            'quantity' => '1',
            'product_listid' => '800000FA-1450218051',
            'id' => '3938716373870073',
            'customer_listid' => '8000024C-1450196328',
            'datetime' => '1309966331'
          },
          {
            'amount' => '1.34',
            'quantity' => '1',
            'product_listid' => '800000FC-1450218057',
            'id' => '3938716373870073',
            'customer_listid' => '8000024C-1450196328',
            'datetime' => '1309966331'
          },
          {
            'amount' => '2.14',
            'quantity' => '1',
            'product_listid' => '8000010C-1450218105',
            'id' => '2446438717782054',
            'customer_listid' => '80000245-1450196318',
            'datetime' => '1310146917'
          },
          {
            'amount' => '1.34',
            'quantity' => '1',
            'product_listid' => '800000FC-1450218057',
            'id' => '2446438717782054',
            'customer_listid' => '80000245-1450196318',
            'datetime' => '1310146917'
          }
        ];
[download]

Now, I want to re-index this flat set of rows by that id field as follows:

[ $id1 => [ { $hashrefs_with_id1 } ... ]
  $id2 => [ { $hashrefs_with_id2 } ... ]
]
[download]

I tried the map_hashes method of my favorite DBI wrapper, DBIx::Simple, but it only returns one hashref for each mapping key:

$VAR1 = {
          '2446438717782054' => {
                                  'amount' => '1.34',
                                  'quantity' => '1',
                                  'product_listid' => '800000FC-145021
+8057',
                                  'customer_listid' => '80000245-14501
+96318',
                                  'datetime' => '1310146917'
                                },
          '3938716373870073' => {
                                  'amount' => '1.34',
                                  'quantity' => '1',
                                  'product_listid' => '800000FC-145021
+8057',
                                  'customer_listid' => '8000024C-14501
+96328',
                                  'datetime' => '1309966331'
                                }
        };
[download]

and I want an arrayref of them all. It's easy enough for me to write something to do this:

my @row = $r->hashes; # produce flat format of arrays of hashrefs
my %row;
for my $row (@row) {
  push @{$row{$row->{id}}}, $row;
}
warn Dumper(\%row);
[download]

but someone has to have needed this and written it already... maybe there's a data structure utility that does this sort of reworking of an array? UPDATEDBIx::SQLCrosstab does exactly what I want, except that it aggregates the non-keyed columns instead of making an arrayref of hashrefs out of them. For now, I will just code it.

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