This is how it is done in ClickHouse. It has Nullable(T) type. The functions of non-Nullable types will return non-Nullable types (except some specific function

This is how it is done in ClickHouse. It has Nullable(T) type. The functions of non-Nullable types will return non-Nullable types (except some specific functions). https://clickhouse.tech/docs/en/sql-reference/data-types/nullable/ https://clickhouse.tech/docs/en/sql-reference/data-types/nul...