PruneEmptyRules#JOIN_RIGHT_INSTANCE wrong behavior for JoinRelType.ANTI

The rule PruneEmptyRules#JOIN_RIGHT_INSTANCE "converts a Join to empty if its right child is empty", e.g.

Join(Scan(Emp), Empty, INNER) becomes Empty

The rule verifies that the join type cannot be LEFT / FULL, and the transformation is not performed in those cases:

if (join.getJoinType().generatesNullsOnRight()) { // i.e. JoinType == LEFT ||   JoinType == FULL
  // "select * from emp left join dept" is not necessarily empty if dept is empty
  return;
}

However in case of ANTI, it performs the transformation:

Join(Scan(Emp), Empty, ANTI) becomes Empty

but this transformation is wrong for anti-join, in this case the actual result should be:

Join(Scan(Emp), Empty, ANTI) becomes Scan(Emp)

in case of anti equi-join (in case of non-equi, no transformation shall be made).