[jira] [Comment Edited] (ARROW-16872) [Python] open_csv throws ArrowInvalid if csv does not end with a new line and is above 16384 lines

["Yibo Cai (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-16872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17558433#comment-17558433 ] 

Yibo Cai edited comment on ARROW-16872 at 6/24/22 11:01 AM:
------------------------------------------------------------

This is a bug in CSV parser for a rare edge case. Will upload a PR to fix it soon.
Thanks [~frederikfab] to catch it!


was (Author: yibo):
This is a bug in CSV writer for a rare edge case. Will upload a PR to fix it soon.
Thanks [~frederikfab] to catch it!

> [Python] open_csv throws ArrowInvalid if csv does not end with a new line and is above 16384 lines
> --------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-16872
>                 URL: https://issues.apache.org/jira/browse/ARROW-16872
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 7.0.0, 8.0.0
>            Reporter: Frederik Fabritius
>            Assignee: Yibo Cai
>            Priority: Major
>              Labels: csvparser, open_csv
>
> `pyarrow.csv.open_csv` throws ArrowInvalid if csv does not end with a new line and is above 16384 lines. Tested with both pyarrow 7.0.0 and 8.0.0. Error seen both in production app and on developer laptop.
>  
> Here's a minimal case for reproducing the issue:
> ```python
> import pyarrow as pa
> import pyarrow.csv
> from io import BytesIO
> for _ in pa.csv.open_csv(BytesIO('\n'.join(['review_id,filter_outcome'] + ['62593aaec7628b203bad4c6e,fabrication']*16385).encode())): pass
> ```
>  
> Error is thrown: 
> ArrowInvalid: CSV parse error: Expected 2 columns, got 1: 



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