emkornfield commented on a change in pull request #7887:
URL: https://github.com/apache/arrow/pull/7887#discussion_r486028649
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File path: cpp/src/arrow/array/builder_base.h
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@@ -98,6 +98,9 @@ class ARROW_EXPORT ArrayBuilder {
virtual Status AppendNull() = 0;
virtual Status AppendNulls(int64_t length) = 0;
+ virtual Status AppendEmptyValue() = 0;
Review comment:
these could really use some documentation it isn't entirely clear to me
there purpose, and why they are separate from append null and what
functionality ends up changing by call this in structbuilder.AppendNull
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