[jira] [Commented] (ARROW-8228) [C++][Parquet] Support writing lists that have null elements that are non-empty.

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-8228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17203349#comment-17203349 ] 

Antoine Pitrou commented on ARROW-8228:
---------------------------------------

[~emkornfield@gmail.com] Can you elaborate on what's needed here?

The following is working at least:
{code:python}
>>> table = pa.table({"lists": [[1,2,None], None, [], [4,5]]})
>>> pq.write_table(table, "tt.pq")
>>> pq.read_table("tt.pq")
pyarrow.Table
lists: list<item: int64>
  child 0, item: int64
>>> pq.read_table("tt.pq").to_pandas()
             lists
0  [1.0, 2.0, nan]
1             None
2               []
3       [4.0, 5.0]
{code}


> [C++][Parquet] Support writing lists that have null elements that are non-empty.
> --------------------------------------------------------------------------------
>
>                 Key: ARROW-8228
>                 URL: https://issues.apache.org/jira/browse/ARROW-8228
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Micah Kornfield
>            Priority: Major
>             Fix For: 2.0.0
>
>
> With the new V2 level writing engine we can detect this case but fail as not implemented.  Fixing this will require changes to the "core" parquet API.



--
This message was sent by Atlassian Jira
(v8.3.4#803005)