zagto commented on code in PR #33831:
URL: https://github.com/apache/arrow/pull/33831#discussion_r1083519602


##########
docs/source/format/Columnar.rst:
##########
@@ -815,6 +815,9 @@ A run must have have a length of at least 1. This means the 
values in the
 run ends array all are positive and in strictly ascending order. A run end 
cannot be
 null.
 
+The REE parent has no validity bitmap, and it's null count field should always 
be 0.
+validity bitmap. Null values are encoded as runs with the value null.

Review Comment:
   Thanks! fixed



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