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https://issues.apache.org/jira/browse/ARROW-18049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicola Crane updated ARROW-18049:
---------------------------------
Parent: ARROW-18181
Issue Type: Sub-task (was: Improvement)
> [R] Support column renaming in col_select argument to file reading functions
> ----------------------------------------------------------------------------
>
> Key: ARROW-18049
> URL: https://issues.apache.org/jira/browse/ARROW-18049
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: R
> Reporter: Nicola Crane
> Priority: Major
> Labels: good-first-issue
>
> We should support the ability to rename columns when reading in data via the
> CSV/Parquet/Feather/JSON file readers.
> We currently have an argument {{col_select}}, which allows users to choose
> which columns to read in, but renaming doesn't work.
> To implement this, we'd need to check if any columns have been renamed by
> {{col_select}} and then updating the schema of the object being returned once
> the file has been read.
> {code:r}
> library(readr)
> library(arrow)
> readr::read_csv(readr_example("mtcars.csv"), col_select = c(not_hp = hp))
> #> # A tibble: 32 × 1
> #> not_hp
> #> <dbl>
> #> 1 110
> #> 2 110
> #> 3 93
> #> 4 110
> #> 5 175
> #> 6 105
> #> 7 245
> #> 8 62
> #> 9 95
> #> 10 123
> #> # … with 22 more rows
> arrow::read_csv_arrow(readr_example("mtcars.csv"), col_select = c(not_hp =
> hp))
> #> # A tibble: 32 × 1
> #> hp
> #> <int>
> #> 1 110
> #> 2 110
> #> 3 93
> #> 4 110
> #> 5 175
> #> 6 105
> #> 7 245
> #> 8 62
> #> 9 95
> #> 10 123
> #> # … with 22 more rows
> {code}
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