calling cursor.nextset() after cursor.fetchone() can cause query hang

[darkag]

hello,

while trying to implement a workaround for this issue on apache airflow (cf. this issue. I've found that the following code:

cursor.execute(sql)
cursor.fetchall()
while cursor.nextset():
        cursor.fetchone()

causes execution hang when sql is two insert queries and the second one causes an error or if the second query is a select the error is not caused by the first rows returned by this select (like when you select col1 / col2 and col2 is 0 for some rows).

It seems that in this case the errormessage is not processed neither in fetchone nor in flush_to_end_of_result function making this one waits for a END_OF_RESULT_RESPONSES message that will never come.

[sitingren]

The fix published in v1.3.5.