def METHOD_NAME():
    with op.batch_alter_table("clusters", schema=None) as batch_op:
        batch_op.alter_column(
            "broker_endpoint",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
        batch_op.alter_column(
            "broker_host",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
        batch_op.alter_column(
            "coordinator_endpoint",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
        batch_op.alter_column(
            "coordinator_host",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
    with op.batch_alter_table("columns", schema=None) as batch_op:
        batch_op.alter_column(
            "column_name",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
    with op.batch_alter_table("datasources", schema=None) as batch_op:
        batch_op.alter_column(
            "datasource_name",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
    with op.batch_alter_table("table_columns", schema=None) as batch_op:
        batch_op.alter_column(
            "column_name",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )
    with op.batch_alter_table("tables", schema=None) as batch_op:
        batch_op.alter_column(
            "schema",
            existing_type=sa.VARCHAR(length=256),
            type_=sa.String(length=255),
            existing_nullable=True,
        )