Itai Incze created ARROW-809:
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Summary: C++: Writing sliced record batch to IPC writes the entire
array
Key: ARROW-809
URL: https://issues.apache.org/jira/browse/ARROW-809
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Itai Incze
Priority: Minor
The bug can be triggered through python:
{code}
import pyarrow.parquet
array = pyarrow.array.from_pylist([1] * 100000)
rb = pyarrow.RecordBatch.from_arrays([array], ['a'])
rb2 = rb.slice(0,2)
with open('/tmp/t.arrow', 'wb') as f:
w = pyarrow.ipc.FileWriter(f, rb.schema)
w.write_batch(rb2)
w.close()
{code}
which will result in a big file:
{code}
$ ll /tmp/t2.arrow
-rw-rw-r-- 1 itai itai 800618 Apr 12 13:22 /tmp/t.arrow
{code}
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