Wes McKinney created ARROW-8903:
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Summary: [C++] Implement optimized "unsafe take" for use with
selection vectors for kernel execution
Key: ARROW-8903
URL: https://issues.apache.org/jira/browse/ARROW-8903
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
Selection vectors constructed from filters do not need to be subjected to
boundschecking and other such safety checks as are present with a usual
invocation of {{take}}. So based on the type width of a selection vector
(uint16?) we should implement highly streamlined take implementations that
additionally take into consideration that selection vectors are monotonic by
construction
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