airflow 0024_1_8_2_make_xcom_value_column_a_large_binary 源码
airflow 0024_1_8_2_make_xcom_value_column_a_large_binary 代码
文件路径：/airflow/migrations/versions/0024_1_8_2_make_xcom_value_column_a_large_binary.py
#
# 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.
"""Make xcom value column a large binary
Revision ID: bdaa763e6c56
Revises: cc1e65623dc7
Create Date: 2017-08-14 16:06:31.568971
"""
from __future__ import annotations
import dill
import sqlalchemy as sa
from alembic import op
# revision identifiers, used by Alembic.
revision = 'bdaa763e6c56'
down_revision = 'cc1e65623dc7'
branch_labels = None
depends_on = None
airflow_version = '1.8.2'
def upgrade():
# There can be data truncation here as LargeBinary can be smaller than the pickle
# type.
# use batch_alter_table to support SQLite workaround
with op.batch_alter_table("xcom") as batch_op:
batch_op.alter_column('value', type_=sa.LargeBinary())
def downgrade():
# use batch_alter_table to support SQLite workaround
with op.batch_alter_table("xcom") as batch_op:
batch_op.alter_column('value', type_=sa.PickleType(pickler=dill))
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