wesm commented on a change in pull request #7535:
URL: https://github.com/apache/arrow/pull/7535#discussion_r447692444
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File path: docs/source/format/Columnar.rst
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@@ -688,11 +687,10 @@ will have the following layout: ::
|------------|-----------------------|
| joemark | unspecified (padding) |
-Similar to structs, a particular child array may have a non-null slot
-even if the validity bitmap of the parent union array indicates the
-slot is null. Additionally, a child array may have a non-null slot
-even if the types array indicates that a slot contains a different
-type at the index.
+Note that a child array may have a non-null slot even if the types array
+indicates that a slot contains a different type at the index, so the
Review comment:
OK
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