code: def dump_schema(db_uri):
      engine = create_engine(db_uri)
      created_tables_metadata = MetaData()
      created_tables_metadata.reflect(bind=engine)
      # Write out table schema as described in
      # https://docs.sqlalchemy.org/en/13/faq/metadata_schema.html#how-can-i-get-the-create-table-drop-table-output-as-a-string
      lines = []
      for table in created_tables_metadata.sorted_tables:
          # Apply `str.rstrip` to remove trailing whitespaces
          lines += map(str.rstrip, str(CreateTable(table)).splitlines())
      return "\n".join(lines)
  
imports: import difflib
  import re
  from collections import namedtuple
  from pathlib import Path
  import pytest
  import sqlalchemy
  from packaging.version import Version
  from sqlalchemy import create_engine
  from sqlalchemy.schema import CreateTable, MetaData
  import mlflow
  from mlflow.environment_variables import MLFLOW_TRACKING_URI
label_desc: Use image node_id 3 for calling a global function with example usage: dump_schema(db_uri) and returns: str