This changes Sequel's literalization of IN/NOT IN with an empty array value to not return NULL even if one of the referenced columns is NULL:
DB[:test].where(:name=>[]) # SELECT * FROM test WHERE (1 = 0) DB[:test].exclude(:name=>[]) # SELECT * FROM test WHERE (1 = 1)
The default Sequel behavior is to respect NULLs, so that when name is NULL, the expression returns NULL.
You can load this extension into specific datasets:
ds = DB[:table] ds.extension(:empty_array_ignore_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:
DB.extension(:empty_array_ignore_nulls)