Simon Willnauer d338a09812 Remove mapping.single_type from parent join test (#25391)
This removes the remaining usage of `mapping.single_type` from the parent join
module and moves it's bwc test to the mixed cluster tests

Relates to #24961
Relates to #20257
2017-06-26 17:33:07 +02:00
..
2017-05-12 15:58:06 +02:00