[GitHub] [arrow] jp0317 commented on a diff in pull request #36180: GH-36178: [C++]support prefetching for ReadRangeCache lazy mode

["jp0317 (via GitHub)" <gi...@apache.org>]

jp0317 commented on code in PR #36180:
URL: https://github.com/apache/arrow/pull/36180#discussion_r1244509487


##########
cpp/src/arrow/io/caching.cc:
##########
@@ -204,6 +206,17 @@ struct ReadRangeCache::Impl {
     if (it != entries.end() && it->range.Contains(range)) {
       auto fut = MaybeRead(&*it);
       ARROW_ASSIGN_OR_RAISE(auto buf, fut.result());
+      if (options.lazy && options.prefetch_limit > 0) {
+        int64_t num_prefetched = 0;
+        for (auto next_it = it + 1;
+             next_it != entries.end() && num_prefetched++ < options.prefetch_limit;

Review Comment:
   Thanks for your review! Updated as suggested.



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