pitrou commented on a change in pull request #12019:
URL: https://github.com/apache/arrow/pull/12019#discussion_r778202893
##########
File path: docs/source/format/Columnar.rst
##########
@@ -309,7 +309,11 @@ That is, a null value may occupy a **non-empty** memory
space in the data
buffer. When this is true, the content of the corresponding memory space
is undefined.
-Generally the first value in the offsets array is 0, and the last slot
+Offsets must be monotonically increasing, that is `offsets[j+1] >= offsets[j]`
for
+`0 <= j < length`, even for null slots. This property ensures the
+**location** for all values is valid and well defined.
Review comment:
```suggestion
Offsets must be monotonically increasing, that is ``offsets[j+1] >=
offsets[j]``
for ``0 <= j < length``, even for null slots. This property ensures the
location for all values is valid and well defined.
```
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