You are viewing a plain text version of this content. The canonical link for it is here.
Posted to jira@arrow.apache.org by "Weston Pace (Jira)" <ji...@apache.org> on 2022/01/28 08:43:00 UTC
[jira] [Resolved] (ARROW-13467) [C++] Support delta dictionaries in the IPC file format
[ https://issues.apache.org/jira/browse/ARROW-13467?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Weston Pace resolved ARROW-13467.
---------------------------------
Resolution: Fixed
Issue resolved by pull request 12160
[https://github.com/apache/arrow/pull/12160]
> [C++] Support delta dictionaries in the IPC file format
> -------------------------------------------------------
>
> Key: ARROW-13467
> URL: https://issues.apache.org/jira/browse/ARROW-13467
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Assignee: Weston Pace
> Priority: Major
> Labels: pull-request-available
> Fix For: 8.0.0, 7.0.1
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> The spec states:
> > In the file format, there is no requirement that dictionary keys should be defined in a
> > {{DictionaryBatch}} before they are used in a {{RecordBatch}}, as long as the keys are
> > defined somewhere in the file. Further more, it is invalid to have more than one *non-delta*
> > dictionary batch per dictionary ID (i.e. dictionary replacement is not supported). Delta
> > dictionaries are applied in the order they appear in the file footer.
> This seems to suggest that dictionary deltas (but not replacements) are allowed. However, both reading and writing an IPC file with a dictionary delta fails.
--
This message was sent by Atlassian Jira
(v8.20.1#820001)