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https://issues.apache.org/jira/browse/ARROW-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16492909#comment-16492909
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Robert Nishihara commented on ARROW-2641:
-----------------------------------------
Most likely unrelated, but we memset some unused padding bytes to 0 in the c++
implementation to make the serialization deterministic. e.g.,
https://github.com/apache/arrow/pull/405
> [C++] Investigate spurious memset() calls
> -----------------------------------------
>
> Key: ARROW-2641
> URL: https://issues.apache.org/jira/browse/ARROW-2641
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 0.9.0
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
>
> {{builder.cc}} has TODO statements of the form:
> {code:c++}
> // TODO(emkornfield) valgrind complains without this
> memset(data_->mutable_data(), 0, static_cast<size_t>(nbytes));
> {code}
> Ideally we shouldn't have to zero-initialize a data buffer before writing to
> it.
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