mapleFU commented on code in PR #47185:
URL: https://github.com/apache/arrow/pull/47185#discussion_r2314810757


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cpp/src/arrow/array/builder_binary.cc:
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@@ -162,7 +164,13 @@ void FixedSizeBinaryBuilder::Reset() {
 
 Status FixedSizeBinaryBuilder::Resize(int64_t capacity) {
   RETURN_NOT_OK(CheckCapacity(capacity));
-  RETURN_NOT_OK(byte_builder_.Resize(capacity * byte_width_));
+  int64_t dest_capacity_bytes;

Review Comment:
   @pitrou gentle ping for idea here, should I prevent overflow from 
`ReserveValues` here?



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