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"""Increase length of pool name

Revision ID: b25a55525161
Revises: bbf4a7ad0465
Create Date: 2020-03-09 08:48:14.534700

"""
from __future__ import annotations

import sqlalchemy as sa
from alembic import op

from airflow.models.base import COLLATION_ARGS

# revision identifiers, used by Alembic.
revision = 'b25a55525161'
down_revision = 'bbf4a7ad0465'
branch_labels = None
depends_on = None
airflow_version = '2.0.0'


def upgrade():
    """Increase column length of pool name from 50 to 256 characters"""
    # use batch_alter_table to support SQLite workaround
    with op.batch_alter_table('slot_pool', table_args=sa.UniqueConstraint('pool')) as batch_op:
        batch_op.alter_column('pool', type_=sa.String(256, **COLLATION_ARGS))


def downgrade():
    """Revert Increased length of pool name from 256 to 50 characters"""
    with op.batch_alter_table('slot_pool', table_args=sa.UniqueConstraint('pool')) as batch_op:
        batch_op.alter_column('pool', type_=sa.String(50))
