viirya commented on a change in pull request #1506:
URL: https://github.com/apache/arrow-rs/pull/1506#discussion_r837797417
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File path: arrow/src/array/array_binary.rs
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@@ -1020,8 +1020,17 @@ impl<'a> std::iter::Iterator for DecimalIter<'a> {
}
}
}
+
+ #[inline]
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ let remain = self.array.len() - self.current;
+ (remain, Some(remain))
+ }
}
+/// iterator has have known size.
+impl<'a> std::iter::ExactSizeIterator for DecimalIter<'a> {}
Review comment:
Should we have it in `iterator.rs`? I see other `ExactSizeIterator`s
implementations located there.
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