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117b05e233
A commit() is emitted after an isolation level change to SNAPSHOT, as both
pyodbc and pymssql open an implicit transaction which blocks subsequent SQL
from being emitted in the current transaction.
Fixes: #4536
Change-Id: If3ba70f495bce2a35a873a3a72d1b30406e678c8
(cherry picked from commit cbc31716c2)