Function applyJoin

src/execution_plan/optimizations/apply_join.c:198–207

TODO: Consider changing Cartesian Products such that each has exactly two child operations. Try to replace Cartesian Products (cross joins) with Value Hash Joins. * This is viable when a Cartesian Product is combining two streams that each satisfies * one side of an EQUALS filter operation, like: * MATCH (a), (b) WHERE ID(a) = ID(b) */

 * one side of an EQUALS filter operation, like:
 * MATCH (a), (b) WHERE ID(a) = ID(b) */
void applyJoin(ExecutionPlan *plan) {
	OpBase **cps = ExecutionPlan_CollectOps(plan->root, OPType_CARTESIAN_PRODUCT);
	uint cp_count = array_len(cps);

	for(uint i = 0; i < cp_count; i++) {
		OpBase *cp = cps[i];
		_reduce_cp_to_hashjoin(plan, cp);
	}
	array_free(cps);
}