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Posted to issues@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2020/02/06 18:52:00 UTC

[jira] [Updated] (ARROW-7662) [R] Support creating ListArray from R list

     [ https://issues.apache.org/jira/browse/ARROW-7662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson updated ARROW-7662:
-----------------------------------
    Summary: [R] Support creating ListArray from R list  (was: [R] Support auto-inferring list column type)

> [R] Support creating ListArray from R list
> ------------------------------------------
>
>                 Key: ARROW-7662
>                 URL: https://issues.apache.org/jira/browse/ARROW-7662
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Michael Chirico
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 5h 20m
>  Remaining Estimate: 0h
>
> {code:r}
> DF = data.frame(a = 1:10)
> DF$b = as.list(DF$a)
> arrow::write_parquet(DF, 'test.parquet')
> # Error in Table__from_dots(dots, schema) : cannot infer type from data
> {code}
> This appears to be supported naturally already in Python:
> {code:python}
> import pandas as pd
> pd.DataFrame({'a': [1, 2, 3], 'b': [[1, 2], [3, 4], [5, 6]]}).to_parquet('test.parquet')
> {code}



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