Summary
Add support for full outer join in TiFlash.
Scope
- support full outer join protocol / join kind plumbing
- guard unsupported cartesian full outer join cases
- make full join output schemas nullable where needed
- support full join with non-equal other conditions
- fix full join other-condition execution path
- add targeted tests and design notes
Summary
Add support for full outer join in TiFlash.
Scope