wgtmac commented on code in PR #861:
URL: https://github.com/apache/iceberg-cpp/pull/861#discussion_r3699642785
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src/iceberg/expression/literal.cc:
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@@ -444,7 +444,9 @@ std::strong_ordering CompareFloat(T lhs, T rhs) {
// and -NAN < NAN.
bool lhs_is_negative = std::signbit(lhs);
bool rhs_is_negative = std::signbit(rhs);
- return lhs_is_negative <=> rhs_is_negative;
+ // A negative sign bit sorts below a positive one (-NaN < +NaN), so a
+ // negative operand must compare as less.
+ return rhs_is_negative <=> lhs_is_negative;
Review Comment:
I would argue that NaN should not actually appear as a `Literal`. This
applies to both lower/upper bounds and expression literal. It is recommended
to use `HasNaN` and `NotHasNaN` predicates for NaN values.
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