makemigrate adds multiple migrations.AddField for same model (django 1.7.1)

Hi,

I have a django model that I just added six new fields to. I ran makemigrations and after that noticed when we ran our rehearsal upgrade with dump of the production database that things took longer than we expected, and checked the processlist. We saw that there were six alter table statements that was executed after each other, each taking around 15 minutes to run.

My expectations were that the migration framework would optimise this and only execute one alter table statement. But obviously it was not. Or is there a bug? :)

Are there anyway to fix this, without having to change the migration and perform the alter table statement with pure SQL?

DB: MySQL

Django 1.7.1

The migrations generated were six of these (only showing one to reduce post size):

migrations.AddField(
    model_name='mymodel',
    name='field_a',
    field=models.BigIntegerField(help_text=b'Blablabla', null=True, db_index=True),
    preserve_default=True,
),

Regards, Peter Lauri

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