amol- commented on a change in pull request #10717:
URL: https://github.com/apache/arrow/pull/10717#discussion_r669634388
##########
File path: python/pyarrow/tests/test_ipc.py
##########
@@ -329,6 +329,42 @@ def test_stream_simple_roundtrip(stream_fixture,
use_legacy_ipc_format):
reader.read_next_batch()
+def test_compression_roundtrip():
+ # The ability to set a seed this way is not present on older versions of
+ # numpy (currently in our python 3.6 CI build). Some inputs might just
+ # happen to compress the same between the two levels so using seeded
+ # random numbers is neccesary
+ if not hasattr(np.random, 'default_rng'):
+ pytest.skip('Requires newer version of numpy')
+ sink = io.BytesIO()
+ rng = np.random.default_rng(seed=42)
+ values = rng.integers(0, 10, 100000)
+ table = pa.Table.from_arrays([values], names=["values"])
+
+ options = pa.ipc.IpcWriteOptions(compression='zstd', compression_level=1)
+ writer = pa.ipc.RecordBatchFileWriter(sink, table.schema, options=options)
Review comment:
Not really a major thing, but given that the `RecordBatchFileWriter` can
act as a context manager and sometimes people look at the tests to learn how to
use things, it might be a good idea to write this in the form of
```
with pa.ipc.RecordBatchFileWriter(sink, table.schema, options=options) as
writer:
writer.write_table(table)
```
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