[Dbix-class] multi-path prefetches

[Mark Hedges]

Did I use prefetch wrong here?

Suppose:
    
    foo 1:M bars
    foo 1:M bizs

    bar 1:1 baz
    biz 1:1 baz

I.e. a foo has bazzes through two different relationship paths.

(i.e. a customer bought a baz and uses it too, or maybe they
bought it and gave it to someone else.)

    my $rs = $schema->resultset('Foo')->search( 
        {   'me.email' => $foo_email },
        {   prefetch => {
                bar => 'baz',
                biz => 'baz',
            }
        },
    );
    my $foo = $rs->next();

DBIx::Class::ResultSet::next(): Error executing 
'SELECT me.email,
 bars.email,
 bars.baz_id,
 baz.baz_id,
 baz.name,
 bizs.email,
 bizs.baz_id,
 baz_2.baz_id,
 baz_2.name,
FROM foo me 

LEFT JOIN bar bars 
ON ( bars.email = me.email )
JOIN baz baz 
ON ( baz.baz_id = bars.baz_id )

LEFT JOIN biz bizs 
ON ( bizs.email = me.email )
JOIN baz baz_2 
ON ( baz_2.baz_id = bizs.baz_id )

LEFT JOIN bar bars                  -- seems like here
ON ( bars.email = me.email )
JOIN baz baz 
ON ( baz.baz_id = bars.baz_id )

LEFT JOIN biz bizs 
ON ( bizs.email = me.email )
JOIN baz baz_2 
ON ( baz_2.baz_id = bizs.baz_id )   -- to here was duplicated for no reason

WHERE ( me.email = ? ) 
ORDER BY bars.email, bizs.email': 

Not unique table/alias: 'bars' at <my script> line 18