I just discovered SQL::Abstract because it's used by Mojo::PG

In SQL::Abstract you can write an insert command like this: 

my $sql= new SQL::Abstract( array_datatypes => 1 );

my $required = {  a => [1, 3, 5],  b => [2, 4, 6],};

my($stmt, @bind)= $sql->insert( testtable => $required );

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This will be created: 

stmt:  "INSERT INTO testtable ( a, b) VALUES ( ?, ? )"
@bind: (
          [
            1,
            3,
            5
          ],
          [
            2,
            4,
            6
          ]
        );

[download]

I receive JSON data in my script and so my data is like this: 

my $data = [
  {a => 1, b => 2},
  {a => 3, b => 4},
  {a => 5, b => 6},
];

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I'm wondering whether or not there is something which would give me the required hash of arrays from my existing array of hashes.

My lengthy attempt is like this: 

# %columns will become the hash of arrays
my %columns;

# Foreach row of data collect its keys and create an empty array in %c
+olumns
$columns{$_} //= [] foreach map { keys %$_ } @$data;

# Then, for each row
foreach my $row ( @$data ) {
  # push the value foreach column
  push @{$columns{$_}}, $row->{$_} foreach keys %columns;
}

[download]

Is there a better way to achieve this transposition?

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to Array of Hashes to Hash of arrays for SQL::Abstract by Skeeve

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