emkornfield commented on a change in pull request #7535:
URL: https://github.com/apache/arrow/pull/7535#discussion_r447396488



##########
File path: docs/source/format/Columnar.rst
##########
@@ -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:
       I have a little trouble parsing this language.  Could it be stated more 
as a positive?
   
   > Only the slot in the array corresponding to the type index is considered.  
All "unselected" values are ignored and could be any semantically correct array 
value.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
us...@infra.apache.org


Reply via email to