Look into IS DISTINCT FROM as an alternative to our current null compensation scheme

SQL Server 2022 has support for IS [NOT] DISTINCT FROM ([docs](https://learn.microsoft.com/en-us/sql/t-sql/queries/is-distinct-from-transact-sql?view=sql-server-ver16)); this is an equality check that treats two nulls as equal (similar to how DISTINCT works in SQL queries).

PostgreSQL has had this for a long time ([docs](https://www.postgresql.org/docs/current/functions-comparison.html)), but last time I checked it didn't utilize indexes. If the SQL Server version does, then we can use this as a terser alternative to the equality operator, which doesn't require null compensation.