Alembic op.alter_column deletes all rows in the database table in error

[Richard]

I have an alembic migration which renames a FK column on a table from 
'customer_id' to 'customer_pk'.

I used to have more in the migration file but narrowed it down to this code 
causing all the rows to be deleted.

def upgrade():
    op.alter_column(
        'daily_smart_meter_readings', column_name='customer_id',
        new_column_name='customer_pk',
    )


I'm using alembic==1.0.0 and Python 3.6.4.

Is there something wrong with the above code or is this a bug in the 
library?

Thanks 

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