romainfrancois opened a new pull request #7435:
URL: https://github.com/apache/arrow/pull/7435


   ``` r
   library(arrow)
   #> 
   #> Attaching package: 'arrow'
   #> The following object is masked from 'package:utils':
   #> 
   #>     timestamp
   Array$create(list(data.frame(a = 1:3, b = 11:13)))
   #> ListArray
   #> <list<item: struct<a: int32, b: int32>>>
   #> [
   #>   -- is_valid: all not null
   #>   -- child 0 type: int32
   #>     [
   #>       1,
   #>       2,
   #>       3
   #>     ]
   #>   -- child 1 type: int32
   #>     [
   #>       11,
   #>       12,
   #>       13
   #>     ]
   #> ]
   ```
   
   <sup>Created on 2020-06-15 by the [reprex 
package](https://reprex.tidyverse.org) (v0.3.0)</sup>
   
   However does not yet deal with the original issue: 
   
   ``` r
   library(arrow)
   #> 
   #> Attaching package: 'arrow'
   #> The following object is masked from 'package:utils':
   #> 
   #>     timestamp
   
   nrows <- 1:3
   df <- tibble::tibble(
       id = 1L,
       data = 
         list(
           tibble::tibble(
             a = letters[nrows],
             b = as.integer(nrows),
             c = as.factor(a),
             d = b/2
           )
         )
     )
   Table$create(df)
   #> Error in Table__from_dots(dots, schema): NotImplemented: Converting 
vector to arrow type dictionary<values=string, indices=int8, ordered=0> not 
implemented
   ```
   
   <sup>Created on 2020-06-15 by the [reprex 
package](https://reprex.tidyverse.org) (v0.3.0)</sup>


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