jorgecarleitao commented on a change in pull request #12019:
URL: https://github.com/apache/arrow/pull/12019#discussion_r773843991
##########
File path: docs/source/format/Columnar.rst
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@@ -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 monotonic, that is `offsets[j+1] >= offsets[j]` for
+`0 <= j < length`, even for null vaues. This property ensures the
Review comment:
```suggestion
`0 <= j < length`, even for null values. This property ensures the
```
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