#27631: Prevent execution of transactionnal DDL statements when unsupported.
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               Reporter:  Simon Charette  |          Owner:  Simon Charette
                   Type:  Bug             |         Status:  assigned
              Component:  Migrations      |        Version:  master
               Severity:  Normal          |       Keywords:
           Triage Stage:  Unreviewed      |      Has patch:  0
    Needs documentation:  0               |    Needs tests:  0
Patch needs improvement:  0               |  Easy pickings:  0
                  UI/UX:  0               |
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 Executing a DDL statement during a transaction on backends that don't
 support it silently commits, leaving `atomic()` in an incoherent state.

 While `schema_editor.execute()` could technically be used to execute DML
 statements such usage should be uncommon as these are usually performed
 through the ORM. In other cases `schema_editor.connection.execute()` can
 be used to circumvent this check.

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Ticket URL: <https://code.djangoproject.com/ticket/27631>
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