rtpsw commented on code in PR #14352:
URL: https://github.com/apache/arrow/pull/14352#discussion_r1056638346
##########
cpp/src/arrow/compute/row/grouper.h:
##########
@@ -39,10 +77,19 @@ class ARROW_EXPORT Grouper {
static Result<std::unique_ptr<Grouper>> Make(const std::vector<TypeHolder>&
key_types,
ExecContext* ctx =
default_exec_context());
- /// Consume a batch of keys, producing the corresponding group ids as an
integer array.
+ /// Consume a batch of keys, producing the corresponding group ids as an
integer array,
+ /// over a slice defined by an offset and length, which defaults to the
batch length.
+ /// Currently only uint32 indices will be produced, eventually the bit width
will only
+ /// be as wide as necessary.
Review Comment:
This is copied from an [existing
comment](https://github.com/apache/arrow/pull/14352/files#diff-f4d905573735385f5e4030a5f22e7653cf0fa379ef192ced676f59c2f7eebb4cR89-R90)
of a method by the same name. I don't mind removing it if you still think it
should be.
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