Since the two branches of the UNION produce disjoint sets, do a UNION ALL (#6546)
Since the two branches of the UNION produce disjoint sets, do a UNION ALL (#6546)

This obviates the need for a sort/eliminate duplicates step, giving a performance boost in some key distributions with large datasets.
hartsock/vault,kingland/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,kingland/vault,kingland/vault,joelthompson/vault,rnaveiras/vault,joelthompson/vault,quixoten/vault,kingland/vault,joelthompson/vault,quixoten/vault,joelthompson/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,rnaveiras/vault,rnaveiras/vault,rnaveiras/vault,quixoten/vault,quixoten/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,hashicorp/vault,hartsock/vault,kingland/vault