niyue commented on code in PR #13041:
URL: https://github.com/apache/arrow/pull/13041#discussion_r980793088
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python/pyarrow/tests/test_ipc.py:
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@@ -945,6 +945,62 @@ def test_ipc_zero_copy_numpy():
assert_frame_equal(df, rdf)
[email protected]
+def test_ipc_batch_with_custom_metadata_roundtrip():
+ df = pd.DataFrame({'foo': [1.5]})
+
+ batch = pa.RecordBatch.from_pandas(df)
+ sink = pa.BufferOutputStream()
+
+ batch_count = 2
+ with pa.ipc.new_file(sink, batch.schema) as writer:
+ for i in range(batch_count):
+ writer.write_batch(batch, {"batch_id": str(i)})
+
+ buffer = sink.getvalue()
+ source = pa.BufferReader(buffer)
+
+ with pa.ipc.open_file(source) as reader:
+ batch_with_metas = [reader.get_batch_with_custom_metadata(
+ i) for i in range(reader.num_record_batches)]
+
+ for i in range(batch_count):
+ assert batch_with_metas[i].batch.num_rows == 1
+ assert batch_with_metas[i].custom_metadata == {"batch_id": str(i)}
+
+
+def batch_with_meta_generator(reader):
+ while True:
+ try:
+ yield reader.read_next_batch_with_custom_metadata()
+ except StopIteration:
+ return
+
+
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+def test_record_batch_reader_with_custom_metadata_roundtrip():
+ df = pd.DataFrame({'foo': [1.5]})
+
+ batch = pa.RecordBatch.from_pandas(df)
+ sink = pa.BufferOutputStream()
+
+ batch_count = 2
+ with pa.ipc.new_stream(sink, batch.schema) as writer:
+ for i in range(batch_count):
+ writer.write_batch(batch, {"batch_id": str(i)})
Review Comment:
Add one more batch without metadata in the test case.
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