David Li created ARROW-13325:
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Summary: [C++] Simplify Call("case_when", ...) expressions
Key: ARROW-13325
URL: https://issues.apache.org/jira/browse/ARROW-13325
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: David Li
case_when will be implemented as case_when(struct(bool...), T...) which
requires materialization of scalar arguments. However, we can simplify such
cases before calling instead, e.g. all scalar false branches can be eliminated,
and scalar true branches can be removed and their values promoted to the 'else'
argument.
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