Wes McKinney created ARROW-16758:
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Summary: [C++] Rewrite ExecuteScalarExpression to not use
ScalarExecutor
Key: ARROW-16758
URL: https://issues.apache.org/jira/browse/ARROW-16758
Project: Apache Arrow
Issue Type: Improvement
Reporter: Wes McKinney
{{ExecuteScalarExpression}} sets up and tears down {{ScalarExecutor}} from
exec.cc for each node in the expression tree. This adds a ton of overhead from
moving around non-trivial objects. After ARROW-16756, we should write a new
ScalarExpressionExecutor which is careful to construct ArraySpans and execute
the expression tree in a much more lightweight / less bloated fashion.
Follow on work in a subsequent Jira will add a pool/stack of allocated
temporary buffers to reuse during execution
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