This changes Sequel's literalization of IN/NOT IN with an empty array value to consider NULL values if one of the referenced columns is NULL:
DB[:test].where(:name=>) # SELECT * FROM test WHERE (name != name) DB[:test].exclude(:name=>) # SELECT * FROM test WHERE (name = name)
The default Sequel behavior is to ignore NULLs, as the above query is not generally optimized well by databases.
You can load this extension into specific datasets:
ds = DB[:table] ds = ds.extension(:empty_array_consider_nulls)
Or you can load it into all of a database's datasets, which is probably the desired behavior if you are using this extension:
Related module: Sequel::EmptyArrayConsiderNulls