airflow 0089_2_2_0_make_xcom_pkey_columns_non_nullable 源码
airflow 0089_2_2_0_make_xcom_pkey_columns_non_nullable 代码
文件路径：/airflow/migrations/versions/0089_2_2_0_make_xcom_pkey_columns_non_nullable.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
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# 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
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# under the License.
"""Make XCom primary key columns non-nullable
Revision ID: e9304a3141f0
Revises: 83f031fd9f1c
Create Date: 2021-04-06 13:22:02.197726
"""
from __future__ import annotations
from alembic import op
from airflow.migrations.db_types import TIMESTAMP, StringID
# revision identifiers, used by Alembic.
revision = 'e9304a3141f0'
down_revision = '83f031fd9f1c'
branch_labels = None
depends_on = None
airflow_version = '2.2.0'
def upgrade():
"""Apply Make XCom primary key columns non-nullable"""
conn = op.get_bind()
with op.batch_alter_table('xcom') as bop:
bop.alter_column("key", type_=StringID(length=512), nullable=False)
bop.alter_column("execution_date", type_=TIMESTAMP, nullable=False)
if conn.dialect.name == 'mssql':
bop.create_primary_key('pk_xcom', ['dag_id', 'task_id', 'key', 'execution_date'])
def downgrade():
"""Unapply Make XCom primary key columns non-nullable"""
conn = op.get_bind()
with op.batch_alter_table('xcom') as bop:
# regardless of what the model defined, the `key` and `execution_date`
# columns were always non-nullable for mysql, sqlite and postgres, so leave them alone
if conn.dialect.name == 'mssql':
bop.drop_constraint('pk_xcom', 'primary')
# execution_date and key wasn't nullable in the other databases
bop.alter_column("key", type_=StringID(length=512), nullable=True)
bop.alter_column("execution_date", type_=TIMESTAMP, nullable=True)
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