zhjwpku commented on code in PR #156:
URL: https://github.com/apache/iceberg-cpp/pull/156#discussion_r2262462751
##########
src/iceberg/transform_function.cc:
##########
@@ -148,14 +253,51 @@ Result<std::unique_ptr<TransformFunction>>
YearTransform::Make(
MonthTransform::MonthTransform(std::shared_ptr<Type> const& source_type)
: TransformFunction(TransformType::kMonth, source_type) {}
-Result<ArrowArray> MonthTransform::Transform(const ArrowArray& input) {
- return NotImplemented("MonthTransform::Transform");
-}
+Result<Literal> MonthTransform::Transform(const Literal& literal) {
+ assert(literal.type() == source_type());
+ if (literal.IsBelowMin() || literal.IsAboveMax()) {
+ return InvalidArgument(
+ "Cannot apply month transform to literal with value {} of type {}",
+ literal.ToString(), source_type()->ToString());
+ }
+ if (literal.IsNull()) [[unlikely]] {
+ return Literal::Null(iceberg::int32());
+ }
-Result<std::shared_ptr<Type>> MonthTransform::ResultType() const {
- return iceberg::int32();
+ using namespace std::chrono; // NOLINT
+ switch (source_type()->type_id()) {
+ case TypeId::kDate: {
+ auto value = std::get<int32_t>(literal.value());
Review Comment:
Good idea.
https://github.com/apache/iceberg-cpp/issues/164
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