Implement a PBT that has a smaller number of threads (e.g. 2-3) where 1 thread is doing random DDLs and other threads are running join queries. The property we should assert on is that for run of a given query that return results, they all return the same results, and for queries where a DDL affects its plan (e.g. dropped index that was in-use), that they do not crash.

We should have a static dataset (not generated by PBT), and it should be appropriately sized so that we have both fast and some slow running join queries.

We should run this PBT on a sanitizer build to detect and race conditions.