bkietz commented on a change in pull request #8126:
URL: https://github.com/apache/arrow/pull/8126#discussion_r485025998
##########
File path: cpp/src/arrow/buffer.cc
##########
@@ -277,13 +277,18 @@ Result<std::unique_ptr<ResizableBuffer>>
AllocateResizableBuffer(const int64_t s
}
Result<std::shared_ptr<Buffer>> AllocateBitmap(int64_t length, MemoryPool*
pool) {
- return AllocateBuffer(BitUtil::BytesForBits(length), pool);
+ ARROW_ASSIGN_OR_RAISE(auto buf,
AllocateBuffer(BitUtil::BytesForBits(length), pool));
+ // Zero out any trailing bits
+ if (buf->size() > 0) {
+ buf->mutable_data()[buf->size() - 1] = 0;
+ }
+ return std::move(buf);
}
Result<std::shared_ptr<Buffer>> AllocateEmptyBitmap(int64_t length,
MemoryPool* pool) {
- ARROW_ASSIGN_OR_RAISE(auto buf, AllocateBitmap(length, pool));
+ ARROW_ASSIGN_OR_RAISE(auto buf,
AllocateBuffer(BitUtil::BytesForBits(length), pool));
Review comment:
It's probably not worth changing that; `AllocateBuffer` zeroes the
padding so this doesn't avoid touching the final cache line of this buffer
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
