Versuchen Sie Folgendes:
select * from test where callValue = 'val3'
union all
(select * from test where callValue < 'val3' order by id desc limit 1)
union all
(select * from test where callValue > 'val3' order by id asc limit 1)
oder
select * from test where id = 8
union all
(select * from test where id < 8 order by id desc limit 1)
union all
(select * from test where id > 8 order by id asc limit 1)
