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  SELECT
    colIP,
...
    SUM(colPartitionFree) as free
  FROM table_name
  GROUP BY colIP

my $rows = ...; # ref to AoH
my %ips;
...
  $ips{ $row->{colIP} }->{ colPartitionFree } += $row->{colPartitionFr
+ee};
}
print Dumper \%ips;