paleolimbot opened a new pull request, #47:
URL: https://github.com/apache/arrow-nanoarrow/pull/47
Allows inspecting schemas (next: arrays and array streams)
``` r
library(nanoarrow)
schema <- infer_nanoarrow_schema(data.frame(a = 1L, b = "two", c =
factor("three")))
# list-like interface for accessing values
schema$format
#> [1] "+s"
schema$children$b$format
#> [1] "u"
schema$children[[3]]
#> <nanoarrow_schema[c]>
#> List of 6
#> $ format : chr "c"
#> $ name : chr "c"
#> $ metadata : list()
#> $ flags : int 2
#> $ children : NULL
#> $ dictionary:List of 6
#> ..$ format : chr "u"
#> ..$ name : chr ""
#> ..$ metadata : list()
#> ..$ flags : int 2
#> ..$ children : NULL
#> ..$ dictionary: NULL
# print/str/format methods (right now just a lazy dump of the list version)
schema
#> <nanoarrow_schema[+s]>
#> List of 6
#> $ format : chr "+s"
#> $ name : chr ""
#> $ metadata : list()
#> $ flags : int 2
#> $ children :List of 3
#> ..$ a:List of 6
#> .. ..$ format : chr "i"
#> .. ..$ name : chr "a"
#> .. ..$ metadata : list()
#> .. ..$ flags : int 2
#> .. ..$ children : NULL
#> .. ..$ dictionary: NULL
#> ..$ b:List of 6
#> .. ..$ format : chr "u"
#> .. ..$ name : chr "b"
#> .. ..$ metadata : list()
#> .. ..$ flags : int 2
#> .. ..$ children : NULL
#> .. ..$ dictionary: NULL
#> ..$ c:List of 6
#> .. ..$ format : chr "c"
#> .. ..$ name : chr "c"
#> .. ..$ metadata : list()
#> .. ..$ flags : int 2
#> .. ..$ children : NULL
#> .. ..$ dictionary:List of 6
#> .. .. ..$ format : chr "u"
#> .. .. ..$ name : chr ""
#> .. .. ..$ metadata : list()
#> .. .. ..$ flags : int 2
#> .. .. ..$ children : NULL
#> .. .. ..$ dictionary: NULL
#> $ dictionary: NULL
```
<sup>Created on 2022-09-12 by the [reprex
package](https://reprex.tidyverse.org) (v2.0.1)</sup>
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