eitsupi opened a new pull request, #33968:
URL: https://github.com/apache/arrow/pull/33968
### Rationale for this change
Allows literal strings to be read directly through the `I()` function in the
same way as the `readr::read_csv()` function.
This is useful for checking behavior without the need to create temporary
files.
### What changes are included in this PR?
In `read_csv_arrow` and `read_json_arrow`, if the first argument `file`
inherits `AsIs` class, `file` is now interpreted as literal data.
This is consistent with the behavior of `readr::read_csv()`, which is widely
used to read text files as data frames.
This is a breaking change because until now the behavior has never changed
with or without `I()`.
#### readr::read_csv
```r
> readr::read_csv(I(readr::readr_example("mtcars.csv")))
Rows: 0 Columns: 1
── Column specification
────────────────────────────────────────────────────────────────────────────────────────────────
Delimiter: ","
chr (1): /usr/local/lib/R/site-library/readr/extdata/mtcars.csv
ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this
message.
# A tibble: 0 × 1
# … with 1 variable:
# /usr/local/lib/R/site-library/readr/extdata/mtcars.csv <chr>
# ℹ Use `colnames()` to see all variable names
```
#### arrow 10.01's arrow::read_csv_arrow
```r
> arrow::read_csv_arrow(I(readr::readr_example("mtcars.csv")))
# A tibble: 32 × 11
mpg cyl disp hp drat wt qsec vs am gear carb
<dbl> <int> <dbl> <int> <dbl> <dbl> <dbl> <int> <int> <int> <int>
1 21 6 160 110 3.9 2.62 16.5 0 1 4 4
2 21 6 160 110 3.9 2.88 17.0 0 1 4 4
3 22.8 4 108 93 3.85 2.32 18.6 1 1 4 1
4 21.4 6 258 110 3.08 3.22 19.4 1 0 3 1
5 18.7 8 360 175 3.15 3.44 17.0 0 0 3 2
6 18.1 6 225 105 2.76 3.46 20.2 1 0 3 1
7 14.3 8 360 245 3.21 3.57 15.8 0 0 3 4
8 24.4 4 147. 62 3.69 3.19 20 1 0 4 2
9 22.8 4 141. 95 3.92 3.15 22.9 1 0 4 2
10 19.2 6 168. 123 3.92 3.44 18.3 1 0 4 4
# … with 22 more rows
# ℹ Use `print(n = ...)` to see more rows
```
#### This PR's arrow::read_csv_arrow
```r
> arrow::read_csv_arrow(I(readr::readr_example("mtcars.csv")))
Error:
! Invalid: CSV parse error: Empty CSV file or block: cannot infer number of
columns
Run `rlang::last_error()` to see where the error occurred.
```
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