test.rql

r.tableCreate('senders');
r.tableCreate('receivers');
r.tableCreate('messages');

r.table('senders').insert({id: 1, sender: 'Sender One'});
r.table('receivers').insert({id: 1, receiver: 'Receiver One'});
r.table('messages').insert([{
    senderId: 1,
    receiverId: 1,
    msg: 'Message One'
}, {
    senderId: 1,
    receiverId: 1,
    msg: 'Message Two'
}, {
    senderId: 1,
    receiverId: 1,
    msg: 'Message Three'
}]);


// returns tree rows, as expected
r.table('messages')
    .eqJoin('senderId', r.table('senders'))
    .without({right: {id: true}})
    .zip()

// returns only one row
r.table('messages')
    .eqJoin('senderId', r.table('senders'))
    .without({right: {id: true}})
    .zip()
    .eqJoin('receiverId', r.table('receivers'))
    .without({right: {id: true}})
    .zip()