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Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2021/06/09 19:05:00 UTC

[jira] [Commented] (ARROW-13028) [C++] CSV add convert option to attempt 32bit number inferences

    [ https://issues.apache.org/jira/browse/ARROW-13028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360291#comment-17360291 ] 

Antoine Pitrou commented on ARROW-13028:
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I'm unsure how much flexibility we want to add to CSV type inference. You can of course pass column types explicitly if you want to optimize memory footprint.

[~npr]  [~jonkeane] What do you think?

> [C++] CSV add convert option to attempt 32bit number inferences
> ---------------------------------------------------------------
>
>                 Key: ARROW-13028
>                 URL: https://issues.apache.org/jira/browse/ARROW-13028
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Nate Clark
>            Assignee: Nate Clark
>            Priority: Major
>
> When types are being inferred by CSV the numbers are always 64 bit. For large data sets it could be better to use 32 bit types to save over all memory. To do this it would be useful to add an option to ConvertOptions to try 32 bit numbers before 64 bit. By default this option would be disabled.



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