paleolimbot opened a new pull request #12324:
URL: https://github.com/apache/arrow/pull/12324
This PR adds `concat_arrays()`, which is available in the Python bindings
but not available in the R bindings. It's a difficult operation to replicate
(although can be done using `ChunkedArray$Take()`) and is a fairly
straightforward binding. I did a tiny bit more than the Python implementation
to support a common type (like `Array$create()`) because it was easy...it
sounds like a more robust approach is coming (via ARROW-14705 or by exposing
`MergeOptions` to `arrow::Concatenate()`).
Reprex:
``` r
library(arrow, warn.conflicts = FALSE)
concat_arrays()
#> Array
#> <null>
#> 0 nulls
concat_arrays(type = int64())
#> Array
#> <int64>
#> []
concat_arrays(Array$create(1:3), Array$create(4:5))
#> Array
#> <int32>
#> [
#> 1,
#> 2,
#> 3,
#> 4,
#> 5
#> ]
# limited support for concatenating Arrays of differing types since this
# isn't exposed by arrow::Concatenate() yet
concat_arrays(
Array$create(1:3, type = float32()),
Array$create(4:5, type = float64()),
type = int64()
)
#> Array
#> <int64>
#> [
#> 1,
#> 2,
#> 3,
#> 4,
#> 5
#> ]
concat_arrays(
Array$create(1:3, type = float32()),
Array$create(4:5, type = float64())
)
#> Error: Invalid: arrays to be concatenated must be identically typed, but
float and double were encountered.
```
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