Refined the prefiltering
Refined the prefiltering


Former-commit-id: 9d80cfe8faed7bbaf620d77f9d53bf00ae43b776 [formerly aa1138a6b60581230b4061f0f01326b17aa31b9e]
Former-commit-id: 75aa4ac880fbffc6921cfe6726a3c573bd100526
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine