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https://issues.apache.org/jira/browse/ARROW-6042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-6042.
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Resolution: Fixed
Issue resolved by pull request 4956
[https://github.com/apache/arrow/pull/4956]
> [C++] Implement alternative DictionaryBuilder that always yields int32 indices
> ------------------------------------------------------------------------------
>
> Key: ARROW-6042
> URL: https://issues.apache.org/jira/browse/ARROW-6042
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> One problem with the current {{DictionaryBuilder<T>}} in some applications is
> that, if it is used to produce a series of arrays to form a ChunkedArray, it
> may yield constituent chunks having different index widths. For example:
> {code}
> chunk 0: int8 indices
> chunk 1: int16 indices
> chunk 2: int16 indices
> chunk 3: int32 indices
> chunk 4: int32 indices
> chunk 5: int32 indices
> chunk 6: int32 indices
> {code}
> Obviously this is problematic for these applications. I'm running into this
> issue in the context of ARROW-3772 where we are looking to decode Parquet
> data directly to {{DictionaryArray}} without stepping through an intermediate
> dense decoded stage.
> I'm not sure what to call the class, whether {{DictionaryInt32Builder}} or
> something similar, but this would be the same API more or less as
> {{DictionaryBuilder}} but instead use {{Int32Builder}} for the indices rather
> than {{AdaptiveIntBuilder}}.
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