ImplicitCollection: thread-checker fixes
ImplicitCollectionIterator is not thread-safe due to the use of the
mutable m_rowBuffer. This also makes ImplicitCollection not
thread-safe (strictly speaking only the newQuery method).
ImplicitCollectionIterator is not thread-safe due to the use of the
mutable m_rowBuffer. This also makes ImplicitCollection not
thread-safe (strictly speaking only the newQuery method).