Relax query flattener constraint (3b) and thereby allow flattening the RHS of a LEFT JOIN even if the RHS contains a virtual table. This is a performance optimization that would not normally be found on a patch branch, but downstream needs it and does not want to wait on the next full release. (tags: branch-3.50)

Relax query flattener constraint (3b) and thereby allow flattening the RHS of a LEFT JOIN even if the RHS contains a virtual table. This is a performance optimization that would not normally be found on a patch branch, but downstream needs it and does not want to wait on the next full release. (tags: branch-3.50)