cyb70289 commented on a change in pull request #12221:
URL: https://github.com/apache/arrow/pull/12221#discussion_r790089989
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File path: docs/source/format/Columnar.rst
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@@ -76,7 +76,7 @@ concepts, here is a small glossary to help disambiguate.
* **Nested type**: a data type whose full structure depends on one or
more other child types. Two fully-specified nested types are equal
if and only if their child types are equal. For example, ``List<U>``
- is distinct from ``List<V>`` iff U and V are different types.
Review comment:
This is not typo. `iff` means `if and only if`.
In Chinese, "当且仅当" :)
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