[jira] [Created] (ARROW-809) C++: Writing sliced record batch to IPC writes the entire array

["Itai Incze (JIRA)" <ji...@apache.org>]

Itai Incze created ARROW-809:
--------------------------------

             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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