rtpsw commented on code in PR #34311:
URL: https://github.com/apache/arrow/pull/34311#discussion_r1122301127
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cpp/src/arrow/compute/row/grouper.cc:
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@@ -39,12 +43,336 @@
namespace arrow {
using internal::checked_cast;
+using internal::PrimitiveScalarBase;
namespace compute {
namespace {
-struct GrouperImpl : Grouper {
+constexpr uint32_t kNoGroupId = std::numeric_limits<uint32_t>::max();
+
+using group_id_t = std::remove_const<decltype(kNoGroupId)>::type;
+using GroupIdType = CTypeTraits<group_id_t>::ArrowType;
+auto group_id_type = std::make_shared<GroupIdType>();
Review Comment:
For some reason, the above suggestion runs into a warning `returning
reference to temporary`. I'll go with `g_group_id_type`.
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