wgtmac commented on code in PR #2409:
URL: https://github.com/apache/orc/pull/2409#discussion_r2365982180


##########
c++/src/Reader.cc:
##########
@@ -1173,21 +1189,33 @@ namespace orc {
       if (enableAsyncPrefetch_) {
         contents_->evictCache(currentStripeInfo_.offset());
 
-        if (fullyCachedStripes_.find(currentStripe_) != 
fullyCachedStripes_.cend()) {
-          // Current stripe has been fully cached, do nothing.
-        } else if (isSmallStripe(currentStripeInfo_, 
contents_->cacheOptions.rangeSizeLimit)) {
+        auto extractSmallStripeRanges = [this](uint64_t startStripe) {
           std::vector<ReadRange> ranges;
-          uint64_t maxStripe =
-              std::min(lastStripe_, currentStripe_ + 
smallStripeLookAheadLimit_ + 1);
-          for (uint64_t stripe = currentStripe_; stripe < maxStripe; stripe++) 
{
+          uint64_t maxStripe = std::min(lastStripe_, startStripe + 
smallStripeLookAheadLimit_ + 1);

Review Comment:
   If we don't add one, then the loop will do nothing if 
`smallStripeLookAheadLimit_` is 0.



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