westonpace commented on code in PR #13804:
URL: https://github.com/apache/arrow/pull/13804#discussion_r938975758
##########
cpp/src/arrow/dataset/dataset.cc:
##########
@@ -160,6 +160,26 @@ Result<FragmentIterator>
Dataset::GetFragments(compute::Expression predicate) {
:
MakeEmptyIterator<std::shared_ptr<Fragment>>();
}
+Result<FragmentGenerator> Dataset::GetFragmentsAsync() {
+ return GetFragmentsAsync(compute::literal(true));
+}
+
+Result<FragmentGenerator> Dataset::GetFragmentsAsync(compute::Expression
predicate) {
+ ARROW_ASSIGN_OR_RAISE(
+ predicate, SimplifyWithGuarantee(std::move(predicate),
partition_expression_));
+ return predicate.IsSatisfiable()
+ ? GetFragmentsAsyncImpl(std::move(predicate))
+ : MakeEmptyGenerator<FragmentGenerator::result_type::ValueType>();
Review Comment:
```suggestion
: MakeEmptyGenerator<std::shared_ptr<Fragment>>();
```
##########
cpp/src/arrow/dataset/dataset.h:
##########
@@ -134,6 +135,9 @@ class ARROW_DS_EXPORT InMemoryFragment : public Fragment {
/// @}
+using FragmentPtr = std::shared_ptr<Fragment>;
Review Comment:
```suggestion
using FragmentPtr = std::shared_ptr<Fragment>;
```
I think we generally try and avoid using too many `using` statements like
this as it can make the code a bit harder to read for newcomers.
`FragmentGenerator` is probably ok as we have some precedent there.
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