[jira] [Resolved] (ARROW-10406) [C++] Unify dictionaries when writing IPC file in a single shot

["Ben Kietzman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ben Kietzman resolved ARROW-10406.
----------------------------------
    Resolution: Fixed

Issue resolved by pull request 9348
[https://github.com/apache/arrow/pull/9348]

> [C++] Unify dictionaries when writing IPC file in a single shot
> ---------------------------------------------------------------
>
>                 Key: ARROW-10406
>                 URL: https://issues.apache.org/jira/browse/ARROW-10406
>             Project: Apache Arrow
>          Issue Type: Wish
>          Components: C++
>            Reporter: Neal Richardson
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 2h 40m
>  Remaining Estimate: 0h
>
> I read a big (taxi) csv file and specified that I wanted to dictionary-encode some columns. The resulting Table has ChunkedArrays with 1604 chunks. When I go to write this Table to the IPC file format (write_feather), I get an error: 
> {code}
>   Invalid: Dictionary replacement detected when writing IPC file format. Arrow IPC files only support a single dictionary for a given field accross all batches.
> {code}
> I can write this to Parquet and read it back in, and the roundtrip of the data is correct. We should be able to do this in IPC too.



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