pitrou commented on code in PR #39623:
URL: https://github.com/apache/arrow/pull/39623#discussion_r1521652024
##########
python/pyarrow/tests/test_dataset_encryption.py:
##########
@@ -151,3 +155,61 @@ def test_write_dataset_parquet_without_encryption():
with pytest.raises(NotImplementedError):
_ = pformat.make_write_options(encryption_config="some value")
+
+
[email protected](
+ encryption_unavailable, reason="Parquet Encryption is not currently
enabled"
+)
+def test_large_row_encryption_decryption():
+ """Test encryption and decryption of a large number of rows."""
+
+ class NoOpKmsClient(pe.KmsClient):
+ def __init__(self):
+ super().__init__()
+
+ def wrap_key(self, key_bytes: bytes, _: str) -> bytes:
+ b = base64.b64encode(key_bytes)
+ return b
+
+ def unwrap_key(self, wrapped_key: bytes, _: str) -> bytes:
+ b = base64.b64decode(wrapped_key)
+ return b
+
+ row_count = pow(2, 15) + 1
+ table = pa.Table.from_arrays(
+ [pa.array(np.random.rand(row_count), type=pa.float32())], names=["foo"]
+ )
+
+ kms_config = pe.KmsConnectionConfig()
+ crypto_factory = pe.CryptoFactory(lambda _: NoOpKmsClient())
+ encryption_config = pe.EncryptionConfiguration(
+ footer_key="UNIMPORTANT_KEY",
+ column_keys={"UNIMPORTANT_KEY": ["foo"]},
+ double_wrapping=True,
+ plaintext_footer=False,
+ data_key_length_bits=128,
+ )
+ pqe_config = ds.ParquetEncryptionConfig(
+ crypto_factory, kms_config, encryption_config
+ )
+ pqd_config = ds.ParquetDecryptionConfig(
+ crypto_factory, kms_config, pe.DecryptionConfiguration()
+ )
+ scan_options = ds.ParquetFragmentScanOptions(decryption_config=pqd_config)
+ file_format =
ds.ParquetFileFormat(default_fragment_scan_options=scan_options)
+ write_options =
file_format.make_write_options(encryption_config=pqe_config)
+ file_decryption_properties =
crypto_factory.file_decryption_properties(kms_config)
+
+ with tempfile.TemporaryDirectory() as tempdir:
Review Comment:
No problem a priori with this, but within tests we tend to use the `tmpdir`
fixture provided by pytest:
https://docs.pytest.org/en/6.2.x/tmpdir.html#the-tmpdir-fixture
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