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

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-8228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482089#comment-17482089 ] 

Joris Van den Bossche commented on ARROW-8228:
----------------------------------------------

Example with fixed size list:

{code:python}
>>> arr = pa.array([[1, 2], None, [3, 4]], pa.list_(pa.int64(), 2))
>>> arr.values
<pyarrow.lib.Int64Array object at 0x7f64aeebb820>
[
  1,
  2,
  null,
  null,
  3,
  4
]

>>> pq.write_table(pa.table({"col": arr}), "test.parquet")
ArrowNotImplementedError: Lists with non-zero length null components are not supported
{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: 8.0.0
>
>
> 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.



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