[jira] [Created] (ARROW-18049) [R] Support column renaming in col_select argument to file reading functions

["Nicola Crane (Jira)" <ji...@apache.org>]

Nicola Crane created ARROW-18049:
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             Summary: [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: Improvement
          Components: R
            Reporter: Nicola Crane


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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