bdaa763e6c56_make_xcom_value_column_a_large_binary.py 文件源码

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())