Development
NULL Values and Empty Strings
Empty lines have special significance for the SQLLogic test runner: they signify an end of the current statement or query. For that reason, empty strings and NULL values have special syntax that must be used in result verification. NULL values should use the string `NULL`, and empty strings should use the string `(empty)`, e.g.:  
```sql
query II
SELECT NULL, ''
----
NULL
(empty)
```