tianchen92 commented on a change in pull request #7887:
URL: https://github.com/apache/arrow/pull/7887#discussion_r471248061
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File path: cpp/src/arrow/buffer_builder.h
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@@ -292,6 +292,11 @@ class TypedBufferBuilder<bool> {
return Status::OK();
}
+ void AppendEmpty(int64_t num_elements) {
Review comment:
Hmm，here is not "AppendEmpty" API, just move null_bit_map pointer to
avoid set child arrays null when the top-level struct slot is null. I renamed
to "Forward" here.
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