Github user orhankislal commented on the issue:
https://github.com/apache/madlib/pull/325
I agree this is not a great solution. Casting the operators makes it
especially awkward to use. However, we have to consider the following case. If
a module has multiple test files like `graph` and if they re-use the same table
names like `vertex`, then we have to drop them before re-creating. ---
