rtpsw commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1125645306
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cpp/src/arrow/compute/row/grouper.h:
##########
@@ -30,6 +30,49 @@
namespace arrow {
namespace compute {
+/// \brief A segment of contiguous rows for grouping
+struct ARROW_EXPORT GroupingSegment {
+ int64_t offset;
+ int64_t length;
+ bool is_open;
+ bool extends;
+};
+
+inline bool operator==(const GroupingSegment& segment1, const GroupingSegment&
segment2) {
+ return segment1.offset == segment2.offset && segment1.length ==
segment2.length &&
+ segment1.is_open == segment2.is_open && segment1.extends ==
segment2.extends;
+}
+inline bool operator!=(const GroupingSegment& segment1, const GroupingSegment&
segment2) {
+ return !(segment1 == segment2);
+}
+
+/// \brief Computes grouping segments for a batch. Each segment covers rows
with identical
+/// values in the batch. The values in the batch are often selected as keys
from a larger
+/// batch.
+class ARROW_EXPORT GroupingSegmenter {
+ public:
+ virtual ~GroupingSegmenter() = default;
+
+ /// \brief Construct a GroupingSegmenter which receives the specified key
types
+ static Result<std::unique_ptr<GroupingSegmenter>> Make(
+ const std::vector<TypeHolder>& key_types, bool nullable_keys = false,
+ ExecContext* ctx = default_exec_context());
Review Comment:
The template-invocation `GroupClass::Make(...)` passes a single `const
std::vector<TypeHolder>&` parameter. In one case it invokes `Grouper::Make` and
in the second case `RowSegmenter::Make`. These doesn't have the same signature;
in particular they differ on the default parameters. However, both accept a
single `const std::vector<TypeHolder>&` parameter, which can be seen as an
overload-signature that the invocation relies on. If the default values were
removed, this overload-signature would be removed, and the invocation would
break.
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