yordan-pavlov commented on a change in pull request #9588:
URL: https://github.com/apache/arrow/pull/9588#discussion_r584291630



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File path: rust/arrow/src/array/array_string.rs
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@@ -205,28 +205,30 @@ where
         let (_, data_len) = iter.size_hint();
         let data_len = data_len.expect("Iterator must be sized"); // panic if 
no upper bound.

Review comment:
       I was thinking that as well, but I think this is still a useful check 
because (1) it allows the allocation of a more useful initial capacity - the 
lower iterator bound is often 0; and also (2) this check can easily be 
satisfied by using `take()`




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