paimon-python/pypaimon/tests/write/writer_file_cleanup_test.py

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"""Failed normal-file cleanup for composite data writers."""

import tempfile
import unittest
from pathlib import Path
from unittest.mock import patch

import pyarrow as pa

from pypaimon import CatalogFactory, Schema
from pypaimon.execution.python.write.writer.data_vector_writer import DataVectorWriter
from pypaimon.execution.python.write.writer.dedicated_format_writer import DedicatedFormatWriter


class WriterFileCleanupTest(unittest.TestCase):
    def test_metadata_failure_deletes_written_file(self):
        for writer_type in (DataVectorWriter, DedicatedFormatWriter):
            with self.subTest(writer=writer_type.__name__), tempfile.TemporaryDirectory() as tmp:
                catalog = CatalogFactory.create({'warehouse': tmp})
                catalog.create_database('db', False)
                data = pa.table({'id': [1]})
                schema = data.schema
                if writer_type is DedicatedFormatWriter:
                    schema = schema.append(pa.field('payload', pa.large_binary()))
                catalog.create_table('db.t', Schema.from_pyarrow_schema(schema, options={
                    'file.format': 'parquet',
                    'data-evolution.enabled': 'true',
                    'row-tracking.enabled': 'true',
                }), False)
                table = catalog.get_table('db.t')
                writer = writer_type(table, (), 0, 0, table.options, write_cols=['id'])
                writer.write(data.to_batches()[0])

                def fail_after_output(path):
                    self.assertTrue(Path(path).is_file())
                    raise OSError('cannot read file size')

                with patch.object(writer.file_io, 'get_file_size', side_effect=fail_after_output):
                    with self.assertRaisesRegex(OSError, 'cannot read file size'):
                        writer.prepare_commit()
                self.assertEqual(list(Path(tmp).rglob('*.parquet')), [])