code: def setup_presto_if_needed():
      db_uri = (
          app.config.get("SQLALCHEMY_EXAMPLES_URI")
          or app.config["SQLALCHEMY_DATABASE_URI"]
      )
      backend = db_uri.split("://")[0]
      database = get_example_database()
      extra = database.get_extra()
  
      if backend == "presto":
          # decrease poll interval for tests
          extra = {
              **extra,
              "engine_params": {
                  "connect_args": {
                      "poll_interval": app.config[
                          "PRESTO_POLL_INTERVAL"
                      ]
                  }
              },
          }
      else:
          # remove `poll_interval` from databases that do not support it
          extra = {**extra, "engine_params": {}}
      database.extra = json_dumps_w_dates(extra)
      db.session.commit()
  
      if backend in {"presto", "hive"}:
          database = get_example_database()
          with database.get_sqla_engine_with_context() as engine:
              drop_from_schema(engine, CTAS_SCHEMA_NAME)
              engine.execute(
                  f"DROP SCHEMA IF EXISTS {CTAS_SCHEMA_NAME}"
              )
              engine.execute(f"CREATE SCHEMA {CTAS_SCHEMA_NAME}")
  
              drop_from_schema(engine, ADMIN_SCHEMA_NAME)
              engine.execute(
                  f"DROP SCHEMA IF EXISTS {ADMIN_SCHEMA_NAME}"
              )
              engine.execute(f"CREATE SCHEMA {ADMIN_SCHEMA_NAME}")
  
imports: from __future__ import annotations
  import contextlib
  import functools
  import os
  from typing import Any, Callable, TYPE_CHECKING
  from unittest.mock import patch
  import pytest
  from flask.ctx import AppContext
  from flask_appbuilder.security.sqla import models
  from sqlalchemy.engine import Engine
  from superset import db, security_manager
  from superset.extensions import feature_flag_manager
  from superset.utils.core import json_dumps_w_dates
  from superset.utils.database import get_example_database, remove_database
  from tests.integration_tests.test_app import app, login
label_desc: Use image node_id 11 for calling a global function with example usage: setup_presto_if_needed() without return types