lidavidm commented on a change in pull request #11257:
URL: https://github.com/apache/arrow/pull/11257#discussion_r718641233
##########
File path: cpp/src/arrow/compute/kernels/aggregate_basic.cc
##########
@@ -754,6 +839,30 @@ void RegisterScalarAggregateBasic(FunctionRegistry*
registry) {
aggregate::CountInit, func.get());
DCHECK_OK(registry->AddFunction(std::move(func)));
+ func = std::make_shared<ScalarAggregateFunction>(
+ "count_distinct", Arity::Unary(), &count_distinct_doc,
&default_count_options);
+
+ // Takes any input, outputs int64 scalar
+ aggregate::AddCountDistinctKernel<Int8Type>(int8(), func.get());
+ aggregate::AddCountDistinctKernel<Int16Type>(int16(), func.get());
+ aggregate::AddCountDistinctKernel<Int32Type>(int32(), func.get());
+ aggregate::AddCountDistinctKernel<Date32Type>(date32(), func.get());
+ aggregate::AddCountDistinctKernel<Int64Type>(int64(), func.get());
+ aggregate::AddCountDistinctKernel<UInt8Type>(uint8(), func.get());
+ aggregate::AddCountDistinctKernel<UInt16Type>(uint16(), func.get());
+ aggregate::AddCountDistinctKernel<UInt32Type>(uint32(), func.get());
+ aggregate::AddCountDistinctKernel<UInt64Type>(uint64(), func.get());
+ aggregate::AddCountDistinctKernel<FloatType>(float32(), func.get());
+ aggregate::AddCountDistinctKernel<DoubleType>(float64(), func.get());
+ aggregate::AddCountDistinctKernel<Time32Type>(time32(TimeUnit::SECOND),
func.get());
+ aggregate::AddCountDistinctKernel<Time32Type>(time32(TimeUnit::MILLI),
func.get());
+ aggregate::AddCountDistinctKernel<Time64Type>(time64(TimeUnit::MICRO),
func.get());
+ aggregate::AddCountDistinctKernel<Time64Type>(time64(TimeUnit::NANO),
func.get());
+ for (auto u : TimeUnit::values()) {
+ aggregate::AddCountDistinctKernel<TimestampType>(timestamp(u), func.get());
Review comment:
This should probably use
[TimestampTypeUnit](https://github.com/apache/arrow/blob/8d2cda61427af350a1ff7e6abdd07515a5ed094d/cpp/src/arrow/compute/kernel.h#L123)
or else zoned timestamps will get inadvertently rejected.
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