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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/12/16 15:14:07 UTC

[GitHub] [arrow] Yuhta commented on a change in pull request #8933: ARROW-10932: [C++] BinaryMemoTable::CopyOffsets access out-of-bound address when data is empty

Yuhta commented on a change in pull request #8933:
URL: https://github.com/apache/arrow/pull/8933#discussion_r544379156



##########
File path: cpp/src/arrow/util/hashing.h
##########
@@ -690,7 +690,8 @@ class BinaryMemoTable : public MemoTable {
     DCHECK_LE(start, size());
 
     const builder_offset_type* offsets = binary_builder_.offsets_data();
-    const builder_offset_type delta = offsets[start];
+    const builder_offset_type delta =
+        start < binary_builder_.value_data_length() ? offsets[start] : 0;

Review comment:
       I made a mistake here, `binary_builder_.value_data_length()` should be `binary_builder_.length()`




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