In most cases "better" is likely to be subjective. However, I would probably try to loop over $data just once:
use strict;
use warnings;
use Test::More tests => 1;
my $data = [
{a => 1, b => 2},
{a => 3, b => 4},
{a => 5, b => 6}
];
my $want = {
a => [1, 3, 5],
b => [2, 4, 6]
};
my %columns;
for my $row (@$data) {
for my $k (keys %$row) {
$columns{$k} //= [];
push @{$columns{$k}}, $row->{$k};
}
}
is_deeply \%columns, $want;
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