SHIMA Tatsuya created ARROW-17143:
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Summary: [R] Add examples working with `tidyr::unnest`and
`tidyr::unnest_longer`
Key: ARROW-17143
URL: https://issues.apache.org/jira/browse/ARROW-17143
Project: Apache Arrow
Issue Type: Improvement
Components: Documentation, R
Affects Versions: 8.0.1
Reporter: SHIMA Tatsuya
Related to ARROW-8813
The arrow package can convert json files to data frames very easily, but
{{tidyr::unnest_longer}} is needed for array expansion.
Wonder if {{tidyr}} could be added to the recommended package and examples like
this could be included in the documentation and test cases.
{code:r}
tf <- tempfile()
on.exit(unlink(tf))
writeLines('
{ "hello": 3.5, "world": false, "foo": { "bar": [ 1, 2 ] } }
{ "hello": 3.25, "world": null }
{ "hello": 0.0, "world": true, "foo": { "bar": [ 3, 4, 5 ] } }
', tf)
arrow::read_json_arrow(tf) |>
tidyr::unnest(foo, names_sep = ".") |>
tidyr::unnest_longer(foo.bar)
#> # A tibble: 6 × 3
#> hello world foo.bar
#> <dbl> <lgl> <int>
#> 1 3.5 FALSE 1
#> 2 3.5 FALSE 2
#> 3 3.25 NA NA
#> 4 0 TRUE 3
#> 5 0 TRUE 4
#> 6 0 TRUE 5
{code}
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