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"""task_duration

Revision ID: 2e541a1dcfed
Revises: 1b38cef5b76e
Create Date: 2015-10-28 20:38:41.266143

"""

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import mysql

# revision identifiers, used by Alembic.
revision = '2e541a1dcfed'
down_revision = '1b38cef5b76e'
branch_labels = None
depends_on = None


def upgrade():
    # use batch_alter_table to support SQLite workaround
    with op.batch_alter_table("task_instance") as batch_op:
        batch_op.alter_column('duration',
                              existing_type=mysql.INTEGER(display_width=11),
                              type_=sa.Float(),
                              existing_nullable=True)


def downgrade():
    pass
