romainfrancois commented on pull request #11225:
URL: https://github.com/apache/arrow/pull/11225#issuecomment-928085858
individual columns of struct types may now be altrep (still in the case of a
single Array, not yet for ChunkedArray).
``` r
library(arrow, warn.conflicts = FALSE)
#> See arrow_info() for available features
st <- Array$create(data.frame(x = 1:10, y = runif(10)))
.Internal(inspect(
st$as_vector()
))
#> @7ffb06350fc8 19 VECSXP g0c2 [OBJ,REF(1),ATT] (len=2, tl=0)
#> @7ffb04e9aa10 13 INTSXP g0c0 [REF(65535)] arrow::Array<int32, 0 nulls>
len=10, Array=<0x7ffb057572d8>
#> @7ffb04e9aa80 22 EXTPTRSXP g0c0 [REF(4)]
#> @7ffb04e9a700 14 REALSXP g0c0 [REF(65535)] arrow::Array<double, 0
nulls> len=10, Array=<0x7ffb0575ba58>
#> @7ffb04e9a770 22 EXTPTRSXP g0c0 [REF(4)]
#> ATTRIB:
#> @7ffb04e9a508 02 LISTSXP g0c0 [REF(1)]
#> TAG: @7ffafd00ca60 01 SYMSXP g1c0 [MARK,REF(65535),LCK,gp=0x4000]
"row.names" (has value)
#> @7ffb07c49388 13 INTSXP g0c1 [REF(1)] (len=2, tl=0) -2147483648,-10
#> TAG: @7ffafd00cc90 01 SYMSXP g1c0 [MARK,REF(65535),LCK,gp=0x4000]
"names" (has value)
#> @7ffb06350e88 16 STRSXP g0c2 [REF(3)] (len=2, tl=0)
#> @7ffafd050318 09 CHARSXP g1c1 [MARK,REF(253),gp=0x61] [ASCII]
[cached] "x"
#> @7ffafd12e788 09 CHARSXP g1c1 [MARK,REF(36),gp=0x61] [ASCII]
[cached] "y"
#> TAG: @7ffafd00d1d0 01 SYMSXP g1c0 [MARK,REF(45977),LCK,gp=0x6000]
"class" (has value)
#> @7ffb04f58888 16 STRSXP g0c3 [REF(3)] (len=3, tl=0)
#> @7ffb00d67ec8 09 CHARSXP g1c1 [MARK,REF(105),gp=0x61] [ASCII]
[cached] "tbl_df"
#> @7ffb00d67e90 09 CHARSXP g1c1 [MARK,REF(117),gp=0x61] [ASCII]
[cached] "tbl"
#> @7ffafd087648 09 CHARSXP g1c2 [MARK,REF(504),gp=0x61,ATT] [ASCII]
[cached] "data.frame"
```
<sup>Created on 2021-09-27 by the [reprex
package](https://reprex.tidyverse.org) (v2.0.0)</sup>
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