Replace union of RecordSet by union of OrderedSet to reduce the complexity and improve the scalability. It can be a bottleneck to huge number of move to assign. task-2390516 X-original-commit: e89105144a34ee73981db383ac0625dcaf63b27b
Replace union of RecordSet by union of OrderedSet to reduce the complexity and improve the scalability. It can be a bottleneck to huge number of move to assign. task-2390516 X-original-commit: e89105144a34ee73981db383ac0625dcaf63b27b