I spotted a bug in the Python DBAPI driver when fetching results from an EXPLAIN.
>>> import monetdb.sql
>>> db = monetdb.sql.connect(database="demo")
>>> cursor = db.cursor()
>>> cursor.execute("explain select count(*) from sys.tables")
31
>>> cursor.fetchone()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "monetdb/sql/cursors.py", line 203, in fetchone
result = self.__rows[self.rownumber - self.__offset]
IndexError: list index out of range
>>>