pitrou commented on a change in pull request #9267:
URL: https://github.com/apache/arrow/pull/9267#discussion_r560287406
##########
File path: cpp/src/arrow/dataset/expression.cc
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@@ -681,7 +681,7 @@ Result<Expression> FoldConstants(Expression expr) {
if (std::all_of(call->arguments.begin(), call->arguments.end(),
[](const Expression& argument) { return
argument.literal(); })) {
// all arguments are literal; we can evaluate this subexpression
*now*
- static const Datum ignored_input;
+ static const Datum ignored_input = Datum{};
Review comment:
Perhaps we can give Datum a default constructor?
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