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"""Make xcom value column a large binary

Revision ID: bdaa763e6c56
Revises: cc1e65623dc7
Create Date: 2017-08-14 16:06:31.568971

"""
from alembic import op
import dill
import sqlalchemy as sa

# revision identifiers, used by Alembic.
revision = 'bdaa763e6c56'
down_revision = 'cc1e65623dc7'
branch_labels = None
depends_on = None


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))
