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https://issues.apache.org/jira/browse/ARROW-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-7767:
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Fix Version/s: 1.0.0
> [C++] Add a facility to create a Bitmap buffer from an data pointer with a
> specified sentinel
> ---------------------------------------------------------------------------------------------
>
> Key: ARROW-7767
> URL: https://issues.apache.org/jira/browse/ARROW-7767
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, R
> Reporter: Francois Saint-Jacques
> Priority: Major
> Fix For: 1.0.0
>
>
> This is a special case for R and other cases where the null value is
> represented by a sentinel. This would read the data pointer and return a null
> bitmap buffer where bits are activate for every row where the value is not
> the sentinel value. If no sentinel is encountered, return nullptr.
> {code:c++}
> template <typename ArrowType, typename CType = ArrowType::c_type>
> Result<std::shared_ptr<Buffer>> NullBitmapFromSentinelData(MemoryPool* pool,
> const CType* data, size_t n_values, CType sentinel_value);
> {code}
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