I wrote a subroutine to do almost the exact same thing just recently (though I ended up converting it to import to a db). Here it is with my db related stuff commented and fixed to populate a hashref like you've described with some sample usage based on your example.

#!/usr/bin/perl

use strict;
use warnings;

use Data::Dumper;
use Parse::CSV;

my @list_of_fields = qw/
                        field1
                        field2
                        field3
                        field4
                        field5
                        field6
                       /;


my $values = import_csv({  filename => '/tmp/vals.csv',
                           fields   => \@list_of_fields });

print "CSV Import complete...\n";
print Dumper( $values );

# {{{ import_csv
#
sub import_csv {

    my $args = shift;

#   die "No database handle provided for import...\n"  unless defined 
+$args->{dbh};
#   die "No database table provided for import...\n"   unless defined 
+$args->{table};
    die "No database columns provided for import...\n" unless defined 
+$args->{fields};

#   my $dbh    =   $args->{dbh};
    my $table  =   ref $args->{table} eq 'ARRAY'
                 ?     $args->{table}->[0]
                 :     $args->{table} ;

    my $fields =   $args->{fields}
                 ? $args->{fields}
                 : 'auto';



    my $csv = Parse::CSV->new( file   => $args->{filename},
                               fields => $fields,
                               sep_char => '|',
                               );

    my $results = {};

    while ( my $row = $csv->fetch ) {


        my @columns = @{ $fields };

        # Make certain that the number of values returned is
        # equal to the number of columns we're expecting.
        #
        die "Invalid number of columns...\n" unless scalar @columns ==
+ scalar keys %{ $row };

        # Creating placeholders this way so we'll always
        # have the exact right number of placeholders to
        # match the number of values in the columns list for
        # our sql statement.
        #
#       my @placeholders = map { '?' } @$columns;

#       my @values = map { $row->{$_} } sort @columns;


#       my $results = insert_row({  dbh      => $dbh,
#                                   columns  => \@columns,
#                                   table    => $table,
#                                   'values' => \@values,
#                                });

        $results->{ $row->{field1} }->{ $row->{field3} } = $row->{fiel
+d5};


    }
    
    return $results;


} # }}}
[download]

Output:

# perl /tmp/test-parsing.pl
CSV Import complete...
$VAR1 = {
          '200326951' => {
                           'rel_Access2' => '200315786',
                           'rel_Access1' => '200315786'
                         }
        };
[download]

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