andishgar commented on code in PR #47463:
URL: https://github.com/apache/arrow/pull/47463#discussion_r2327573705
##########
cpp/src/arrow/array/statistics.h:
##########
@@ -82,6 +83,11 @@ struct ARROW_EXPORT ArrayStatistics {
/// and when set to `double`, it represents `approximate_distinct_count`.
std::optional<CountType> distinct_count = std::nullopt;
+ /// \brief The maximum length in bytes among the rows of an array, may not
be set
Review Comment:
@kou, what is your opinion on the following comment?
```c++
/// \brief The maximum length in bytes of the rows in an array; may not be
set
/// Note: when the type is `int64_t`, it represents `max_byte_width_exact`,
/// and when the type is `double`, it represents
`max_byte_width_approximate`.
std::optional<SizeType> max_byte_width = std::nullopt;
```
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