examples/distributed/udf-library/python/tests/conftest.py

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from __future__ import annotations

import logging
from typing import TYPE_CHECKING

import pyarrow as pa
import pyarrow.parquet as pq
import pytest

if TYPE_CHECKING:
    import pathlib
    from collections.abc import Generator
    from typing import Any


class _FailOnWarning(logging.Handler):
    def emit(self, record: logging.LogRecord) -> None:
        if record.levelno >= logging.WARNING:
            err = f"Unexpected log warning from '{record.name}': {self.format(record)}"
            raise AssertionError(err)


@pytest.fixture(autouse=True)
def fail_on_log_warnings() -> Generator[None, Any, None]:
    handler = _FailOnWarning()
    logging.root.addHandler(handler)
    yield
    logging.root.removeHandler(handler)


@pytest.fixture
def lineitem(tmp_path: pathlib.Path) -> pathlib.Path:
    """A TPC-H-shaped slice, small enough to check the arithmetic by hand.

    Two files, because the aggregate has to be correct when DataFusion splits
    it into a partial pass per partition and merges the results.
    """
    directory = tmp_path / "lineitem"
    directory.mkdir()
    pq.write_table(
        pa.table(
            {
                "l_extendedprice": [100.0, 200.0],
                "l_discount": [0.0, 0.5],
                "l_tax": [0.0, 0.0],
                "l_quantity": [1.0, 3.0],
            }
        ),
        directory / "part-0.parquet",
    )
    pq.write_table(
        pa.table(
            {
                "l_extendedprice": [400.0],
                "l_discount": [0.25],
                "l_tax": [0.1],
                "l_quantity": [4.0],
            }
        ),
        directory / "part-1.parquet",
    )
    return directory