Always pick the source graph from the right-hand side, because it works for in-pattern expansions and changing of source graphs.
Always pick the source graph from the right-hand side, because it works for in-pattern expansions and changing of source graphs. This relies on the planner always planning _later_ operators on the rhs.
(Changed in version 2.9.0) The behavior of scanRight has changed. The previous behavior can be reproduced with scanRight.reverse.
(Changed in version 2.9.0) transpose throws an IllegalArgumentException if collections are not uniformly sized.