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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