forgot to return index in unordered join

Signed-off-by: Mattias Andrée <maandree@operamail.com>
forgot to notify in unordered join

Signed-off-by: Mattias Andrée <maandree@operamail.com>
do not use conditions when not needed

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add concurrently (extra)

Signed-off-by: Mattias Andrée <maandree@operamail.com>
whoops

Signed-off-by: Mattias Andrée <maandree@operamail.com>