/usr/share/perl5/Tangram/Driver/Pg.pm is in libtangram-perl 2.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55  | package Tangram::Driver::Pg;
use strict;
use Tangram::Core;
use Tangram::Driver::Pg::Storage;
use vars qw(@ISA);
 @ISA = qw( Tangram::Relational );
sub connect
  {
      my ($pkg, $schema, $cs, $user, $pw, $opts) = @_;
      ${$opts||={}}{driver} = $pkg->new();
      my $storage = Tangram::Driver::Pg::Storage->connect
	  ( $schema, $cs, $user, $pw, $opts );
  }
sub blob {
    return "BYTEA";
}
sub date {
    return "DATE";
}
sub bool {
    return "BOOL";
}
use MIME::Base64;
sub to_blob {
    my $self = shift;
    my $value = shift;
    encode_base64($value);
}
sub from_blob {
    my $self = shift;
    my $value = shift;
    decode_base64($value);
}
sub sequence_sql {
    my $self = shift;
    my $sequence_name = shift;
    return "SELECT nextval('$sequence_name')";
}
sub limit_sql {
    my $self = shift;
    return (limit => shift);
}
1;
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