I think your problems stem from your use of curly brackets when you define your array. @column_info is a list containing exactly one element -- a reference to a rather strange hash. To see what you're doing wrong, try adding:

  use Data::Dumper;
  print Dumper(\@Column_Info);
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If you get rid of the curlies (use round parentheses instead), then you'll be able to reference the array as:

my @array = ( [0,0], [0,1], [1,0], [1,1] );
for (my $x=0; $x<4; $x++)
{
  for (my $y=0; $y<2; $y++)
  {
    printf "%d,%d = %n", $x, $y, $array[$x][$y];
  }
}
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