tianchen92 commented on a change in pull request #7887:
URL: https://github.com/apache/arrow/pull/7887#discussion_r486737805
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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:
I add documentation for this API. The change meets the
[spec](http://arrow.apache.org/docs/format/Columnar.html#struct-layout)(There
is no need for the child arrays to be null when the top-level struct slot is
null) .
The difference between append empty and append null value is different.
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