arrow

ARROW-13111: [R] altrep vectors for ChunkedArray

``` r
library(arrow, warn.conflicts = FALSE)
#> See arrow_info() for available features

(c_str <- ChunkedArray$create(c("un", "deux"), c("trois", "quatre")))
#> ChunkedArray
#> [
#>   [
#>     "un",
#>     "deux"
#>   ],
#>   [
#>     "trois",
#>     "quatre"
#>   ]
#> ]
(v_str <- c_str$as_vector())
#> [1] "un"     "deux"   "trois"  "quatre"

.Internal(inspect(v_str))
#> @7ff3ff98f540 16 STRSXP g0c0 [REF(65535)] arrow::ChunkedArray<0x7ff3f64a2128, string, 2 chunks, 0 nulls> len=4
```

<sup>Created on 2021-10-08 by the [reprex package](https://reprex.tidyverse.org) (v2.0.1.9000)</sup>

Only dealing with strings for now, int and double coming next.

Closes #11369 from romainfrancois/ARROW_13111_chunked_array_altrep

Lead-authored-by: Romain Francois <romain@rstudio.com>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>