R-JunmingChen commented on code in PR #37100:
URL: https://github.com/apache/arrow/pull/37100#discussion_r1299584644
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cpp/src/arrow/compute/kernels/aggregate_basic_internal.h:
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@@ -891,6 +891,105 @@ struct NullMinMaxImpl : public ScalarAggregator {
}
};
+template <SimdLevel::type SimdLevel>
+struct DictionaryMinMaxImpl : public ScalarAggregator {
+ using ThisType = DictionaryMinMaxImpl<SimdLevel>;
+
+ DictionaryMinMaxImpl(std::shared_ptr<DataType> out_type,
ScalarAggregateOptions options)
+ : options(std::move(options)),
+ out_type(std::move(out_type)),
+ has_nulls(false),
+ count(0),
+ min(nullptr),
+ max(nullptr) {
+ this->options.min_count = std::max<uint32_t>(1, this->options.min_count);
+ }
+
+ Status Consume(KernelContext*, const ExecSpan& batch) override {
+ if (batch[0].is_scalar()) {
+ return Status::NotImplemented("No min/max implemented for
DictionaryScalar");
+ }
+
+ DictionaryArray arr(batch[0].array.ToArrayData());
+ this->has_nulls = arr.null_count() > 0;
+ this->count += arr.length() - arr.null_count();
+
+ Datum dict_values(arr.dictionary());
+ ARROW_ASSIGN_OR_RAISE(Datum result, MinMax(std::move(dict_values)));
Review Comment:
> ```
> dictionary: ["1", "2", "3"]
> indices: [0, 1, 0, 1]
> ```
It's possible. When a user constructs a DictionaryArray via specifying its
dictionary and indices, it could happen.
To handle it, we need to validate all the indexes in dictionary could be
found in indices at least once. I wonder whether we already have the validation
codes.
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