wesm commented on a change in pull request #7442:
URL: https://github.com/apache/arrow/pull/7442#discussion_r441668163
##########
File path: cpp/src/arrow/compute/api_vector.h
##########
@@ -64,6 +67,24 @@ Result<Datum> Filter(const Datum& values, const Datum&
filter,
const FilterOptions& options = FilterOptions::Defaults(),
ExecContext* ctx = NULLPTR);
+namespace internal {
+
+// These internal functions are implemented in kernels/vector_selection.cc
+
+/// \brief Return the number of selected indices in the boolean filter
+ARROW_EXPORT
+int64_t GetFilterOutputSize(const ArrayData& filter,
Review comment:
OK
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