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https://issues.apache.org/jira/browse/ARROW-13580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-13580.
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Fix Version/s: 6.0.0
Resolution: Fixed
Issue resolved by pull request 10897
[https://github.com/apache/arrow/pull/10897]
> [C++] quoted_strings_can_be_null only applied to string columns
> ---------------------------------------------------------------
>
> Key: ARROW-13580
> URL: https://issues.apache.org/jira/browse/ARROW-13580
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Weston Pace
> Assignee: Weston Pace
> Priority: Major
> Labels: pull-request-available
> Fix For: 6.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> My interpretation of the "string" in quoted_strings_can_be_null is that it is
> referring to the unparsed CSV input string and not the actual output data
> type.
> So when converting:
> {code:csv}
> "one","two","three"
> "1","2","3"
> "4","","6"'
> {code}
> We should get...
> [1, 4], [2, None], [3, 6]
> ...currently we get...
> [1, 4], ['2', None], [3, 6]
> In pandas the above string parses to...
> {code:python}
> >>> f = io.BytesIO(b'"one","two","three"\n"1","2","3"\n"4","","6"')
> >>> pandas.read_csv(f)
> one two three
> 0 1 2.0 3
> 1 4 NaN 6
> {code}
> So this is bringing us closer to pandas which is probably a good thing.
> Inspired by: https://github.com/apache/arrow/issues/10892
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