cyb70289 commented on a change in pull request #12579:
URL: https://github.com/apache/arrow/pull/12579#discussion_r821271455
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File path: cpp/src/arrow/array/builder_base.h
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@@ -250,6 +250,9 @@ class ARROW_EXPORT ArrayBuilder {
// Set the next validity bits to null (i.e. invalid).
void UnsafeSetNull(int64_t length);
+ /// Set the index bit to null or not null
+ void UnsafeSetIsNull(int64_t index, bool is_null);
Review comment:
Looks this api doesn't work for variable length types like string.
Probably should not be in base class.
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