code: def upgrade():
      """
      Increase column size from 50 to 256 characters, closing AIRFLOW-4737 caused
      by broker backends that might use unusually large queue names.
      """
      # use batch_alter_table to support SQLite workaround
      with op.batch_alter_table("task_instance") as batch_op:
          batch_op.alter_column("queue", type_=sa.String(256))
  
imports: from __future__ import annotations
  import sqlalchemy
  from alembic import op
label_desc: Use image node_id 1 for calling a global function with example usage: upgrade() without return types