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https://issues.apache.org/jira/browse/ARROW-9609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman resolved ARROW-9609.
---------------------------------
Resolution: Fixed
Issue resolved by pull request 7896
[https://github.com/apache/arrow/pull/7896]
> [C++] CSV datasets don't materialize virtual columns
> ----------------------------------------------------
>
> Key: ARROW-9609
> URL: https://issues.apache.org/jira/browse/ARROW-9609
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Neal Richardson
> Assignee: Ben Kietzman
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0, 1.0.1
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> They're included but the values are all null.
> Minimal reproducer in R:
> {code:r}
> library(arrow)
> dir.create("testds/c=5", recursive = TRUE)
> cat("a,b\n1,2\n", file = "testds/c=5/test.csv")
> ds <- open_dataset("testds", format = "csv")
> ds
> ## FileSystemDataset with 1 csv file
> ## a: int64
> ## b: int64
> ## c: int32
> dplyr::collect(ds)
> ## # A tibble: 1 x 3
> ## a b c
> ## <int> <int> <int>
> ## 1 1 2 NA
> {code}
>
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