Francois Saint-Jacques created ARROW-7767:
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Summary: [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
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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