Implicit transaction commit in mysql TRUNCATE causes error "There is no active transaction."

In ORMExecutor the code for purging db tables and loading fixtures is wrapped in one transaction.

If I try to purge tables with TRUNCATE (because I want to reset auto-increments) the transaction is implicitly closed and in the next step, when the fixtures are loaded I get: "There is no active transaction."

Any ideas how to fix it properly?