paleolimbot opened a new pull request, #951:
URL: https://github.com/apache/arrow-nanoarrow/pull/951
Adds an `as_nanoarrow_array.nanoarrow_vctr()` fast path for full-slice,
single-chunk vectors. Existing buffers are reused; a shallow array wrapper is
created only when a data-frame field name must be attached. This avoids
extension round-trips such as rebuilding GeoArrow geometry through WK.
On a 3.23M-row GeoArrow reproduction, data-frame-to-stream conversion fell
from 3.44 s to 0.32 s. The available R test suite and `R CMD check --no-manual`
pass.
```r
library(nanoarrow)
x <- as_nanoarrow_vctr(as_nanoarrow_array(c("one", "two")))
as.data.frame(as_nanoarrow_array(data.frame(x = x)))
#> x
#> 1 one
#> 2 two
```
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