old_contents: #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  
  """Change field in DagCode to MEDIUMTEXT for MySql
  
  Revision ID: e959f08ac86c
  Revises: 64a7d6477aae
  Create Date: 2020-12-07 16:31:43.982353
  
  """
  from alembic import op
  from sqlalchemy.dialects import mysql
  
  # revision identifiers, used by Alembic.
  revision = 'e959f08ac86c'
  down_revision = '64a7d6477aae'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():  # noqa: D103
      conn = op.get_bind()  # pylint: disable=no-member
      if conn.dialect.name == "mysql":
          op.alter_column(table_name='dag_code', column_name='source_code', type_=mysql.MEDIUMTEXT)
  
  
  def downgrade():  # noqa: D103
      conn = op.get_bind()  # pylint: disable=no-member
      if conn.dialect.name == "mysql":
          op.alter_column(table_name='dag_code', column_name='source_code', type_=mysql.TEXT)
  
new_contents: #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  
  """Change field in DagCode to MEDIUMTEXT for MySql
  
  Revision ID: e959f08ac86c
  Revises: 64a7d6477aae
  Create Date: 2020-12-07 16:31:43.982353
  
  """
  from alembic import op
  from sqlalchemy.dialects import mysql
  
  # revision identifiers, used by Alembic.
  revision = 'e959f08ac86c'
  down_revision = '64a7d6477aae'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():  # noqa: D103
      conn = op.get_bind()  # pylint: disable=no-member
      if conn.dialect.name == "mysql":
          op.alter_column(
              table_name='dag_code', column_name='source_code', type_=mysql.MEDIUMTEXT, nullable=False
          )
  
  
  def downgrade():  # noqa: D103
      conn = op.get_bind()  # pylint: disable=no-member
      if conn.dialect.name == "mysql":
          op.alter_column(table_name='dag_code', column_name='source_code', type_=mysql.TEXT, nullable=False)
  
subject: Fix broken MySQL Migration (#12904)