pitrou commented on a change in pull request #8309:
URL: https://github.com/apache/arrow/pull/8309#discussion_r498102852
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File path: cpp/src/arrow/array/builder_dict.h
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@@ -190,6 +190,12 @@ class DictionaryBuilderBase : public ArrayBuilder {
/// \brief The current number of entries in the dictionary
int64_t dictionary_length() const { return memo_table_->size(); }
+ /// \brief The value byte width (for FixedSizeBinaryType)
+ template <typename T1 = T>
+ enable_if_fixed_size_binary<T1, int32_t> byte_width() const {
+ return byte_width_;
+ }
+
Review comment:
The property is already exposed in `FixedSizeBinaryBuilder`.
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