kou commented on code in PR #47297:
URL: https://github.com/apache/arrow/pull/47297#discussion_r2286456326
##########
cpp/src/arrow/compute/kernel.cc:
##########
@@ -475,23 +475,78 @@ std::string OutputType::ToString() const {
return "computed";
}
+// ----------------------------------------------------------------------
+// MatchConstraint
+
+std::shared_ptr<MatchConstraint> DecimalsHaveSameScale() {
+ class DecimalsHaveSameScaleConstraint : public MatchConstraint {
+ public:
+ bool Validate(const std::vector<TypeHolder>& types) const override {
+ DCHECK_GE(types.size(), 2);
+ DCHECK(std::all_of(types.begin(), types.end(),
+ [](const TypeHolder& type) { return
is_decimal(type.id()); }));
+ auto ty0 = dynamic_cast<const DecimalType*>(types[0].type);
+ DCHECK_NE(ty0, nullptr);
+ auto s0 = ty0->scale();
+ for (size_t i = 1; i < types.size(); ++i) {
+ auto ty = dynamic_cast<const DecimalType*>(types[i].type);
+ DCHECK_NE(ty, nullptr);
+ if (ty->scale() != s0) {
+ return false;
+ }
+ }
+ return true;
+ }
+ };
+ static auto instance = std::make_shared<DecimalsHaveSameScaleConstraint>();
Review Comment:
It's not a apache/arrow configuration.
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