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https://issues.apache.org/jira/browse/ARROW-13467?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ian Cook updated ARROW-13467:
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Fix Version/s: 7.0.1
> [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: 7.0.1
>
> Time Spent: 1h 20m
> 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.
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