[jira] [Commented] (ARROW-5811) [C++] CSV reader: Ability to not infer column types.

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-5811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16887162#comment-16887162 ] 

Antoine Pitrou commented on ARROW-5811:
---------------------------------------

[~wesmckinn] [~npr] do you have an idea about a desirable API here?

> [C++] CSV reader: Ability to not infer column types.
> ----------------------------------------------------
>
>                 Key: ARROW-5811
>                 URL: https://issues.apache.org/jira/browse/ARROW-5811
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Python
>    Affects Versions: 0.13.0
>         Environment: Ubuntu Xenial
>            Reporter: Bogdan Klichuk
>            Priority: Minor
>              Labels: csv, csvparser, pyarrow
>             Fix For: 1.0.0
>
>
> I'm trying to read CSV as is. All columns as strings. I don't know the schema of these CSVs and they will vary as they are provided by user.
> Right now i'm using pandas.read_csv(dtype=str) which works great, but since final destination of these CSVs are parquet files it seems like much more efficient to use pyarrow.csv.read_csv in future, as soon as this becomes available :)
> I tried things like `pyarrow.csv.read_csv(convert_types=ConvertOptions(columns_types=defaultdict(lambda: 'string')))` but it doesn't work.
> Maybe I just didnt' find something that already exists? :)



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