pitrou commented on code in PR #55449:
URL: https://github.com/apache/arrow/pull/55449#discussion_r4551451895


##########
cpp/src/arrow/util/alp/alp_sampler_internal.h:
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@@ -34,7 +34,7 @@ namespace arrow::util::alp {
 template <AlpFloatingType T>
 class ARROW_EXPORT AlpSampler {
  public:
-  AlpSampler() = default;
+  explicit AlpSampler(int64_t sampling_window_size);

Review Comment:
   > Should we do this in a separate PR once we are more confident when a 
better approach has been found?
   
   What is "this" in your question? :)



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