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

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-809.
--------------------------------
    Resolution: Fixed

Issue resolved by pull request 555
[https://github.com/apache/arrow/pull/555]

> 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
>            Assignee: Wes McKinney
>            Priority: Minor
>             Fix For: 0.3.0
>
>
> The bug can be triggered through python:
> {code}
> import pyarrow.parquet
> array = pyarrow.array.from_pylist([1] * 1000000)
> 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/t.arrow 
> -rw-rw-r-- 1 itai itai 800618 Apr 12 13:22 /tmp/t.arrow
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)