drop_column(mssql_drop_check=True) doesn't quote names properly when generating 'drop constraint' SQL

[sqlalchemy-bot]

Migrated issue, originally created by Marek Baczyński (@imbaczek)

DB: SQL Server 2008R2

SQLAlchemy==0.9.3

alembic==0.6.4dev

def upgrade():
    ### commands auto generated by Alembic - please adjust! ###
    op.add_column('table', sa.Column('col3', sa.Boolean(name='ck_col3'), nullable=True))
    ### end Alembic commands ###


def downgrade():
    ### commands auto generated by Alembic - please adjust! ###
    op.drop_column('table', 'col3', mssql_drop_check=True)
    ### end Alembic commands ###

when downgrading, alembic emits the following SQL

declare @const_name varchar(256)
select @const_name = [name] from sys.check_constraints
where parent_object_id = object_id('table')
and col_name(parent_object_id, parent_column_id) = 'col3'
-- expected
exec('alter table [table] drop constraint [' + @const_name + ']')
-- actually emitted
exec('alter table table drop constraint ' + @const_name)

[sqlalchemy-bot]

Michael Bayer (@zzzeek) wrote:

• Added quoting to the table name when the special EXEC is run to
  drop any existing server defaults or constraints when the
  :paramref:.drop_column.mssql_drop_check or
  :paramref:.drop_column.mssql_drop_default
  arguments are used. fix #186

→ efecc6c

[sqlalchemy-bot]

Changes by Michael Bayer (@zzzeek):

• changed status to closed