airflow 0090_2_2_0_rename_concurrency_column_in_dag_table_ 源码
airflow 0090_2_2_0_rename_concurrency_column_in_dagtable 代码
文件路径：/airflow/migrations/versions/0090_2_2_0_rename_concurrency_column_in_dagtable.py
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# to you under the Apache License, Version 2.0 (the
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"""Rename ``concurrency`` column in ``dag`` table to`` max_active_tasks``
Revision ID: 30867afad44a
Revises: e9304a3141f0
Create Date: 2021-06-04 22:11:19.849981
"""
from __future__ import annotations
import sqlalchemy as sa
from alembic import op
# revision identifiers, used by Alembic.
revision = '30867afad44a'
down_revision = 'e9304a3141f0'
branch_labels = None
depends_on = None
airflow_version = '2.2.0'
def upgrade():
"""Apply Rename ``concurrency`` column in ``dag`` table to`` max_active_tasks``"""
conn = op.get_bind()
is_sqlite = bool(conn.dialect.name == "sqlite")
if is_sqlite:
op.execute("PRAGMA foreign_keys=off")
with op.batch_alter_table('dag') as batch_op:
batch_op.alter_column(
'concurrency',
new_column_name='max_active_tasks',
type_=sa.Integer(),
nullable=False,
)
if is_sqlite:
op.execute("PRAGMA foreign_keys=on")
def downgrade():
"""Unapply Rename ``concurrency`` column in ``dag`` table to`` max_active_tasks``"""
with op.batch_alter_table('dag') as batch_op:
batch_op.alter_column(
'max_active_tasks',
new_column_name='concurrency',
type_=sa.Integer(),
nullable=False,
)
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