bkietz commented on a change in pull request #9621:
URL: https://github.com/apache/arrow/pull/9621#discussion_r599003271
##########
File path: cpp/src/arrow/compute/api_aggregate.h
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@@ -306,5 +306,100 @@ Result<Datum> TDigest(const Datum& value,
const TDigestOptions& options =
TDigestOptions::Defaults(),
ExecContext* ctx = NULLPTR);
+namespace internal {
+
+/// Internal use only: streaming group identifier.
Review comment:
These are made available for testing from R, which could not access an
_internal header (since it wouldn't be installed)
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