HepPlanner doesn't clear metadata cache for the ancestors of discarded node when a transformation happens

In HepPlanner, when a transformation happens, it will clear metadata cache for the parent of the discarded node[1]. But it doesn't clear the metadata cache for the ancestors of the parent. For example, assume we get a logical plan like

A

  \

   B

     \

      C

, if we clear the metadata cache for C after applying a rule, we should also clear the metadata cache for A and B since metadata of A and B derive from C.

[1]https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/plan/hep/HepPlanner.java#L877