code: def test_stream_empty_file(tmp_path: Path) -> None:
      p = tmp_path / "in.parquet"
      schema = {
          "KLN_NR": pl.String,
      }
  
      df = pl.DataFrame(
          {
              "KLN_NR": [],
          },
          schema=schema,
      )
      df.write_parquet(p)
      assert pl.scan_parquet(p).collect(streaming=True).schema == schema
  
imports: from __future__ import annotations
  import os
  import tempfile
  import time
  from datetime import date
  from pathlib import Path
  from typing import TYPE_CHECKING, Any
  import numpy
  import pytest
  import polars
  from polars.exceptions import PolarsInefficientMapWarning
  from polars.testing import assert_frame_equal
label_desc: Use image node_id 12 for calling a global function with example usage: test_stream_empty_file(tmp_path) without return types