[GitHub] [arrow] mapleFU commented on a diff in pull request #35628: GH-35627: [C++][Format][Integration] Add string view to the arrow format

["mapleFU (via GitHub)" <gi...@apache.org>]

mapleFU commented on code in PR #35628:
URL: https://github.com/apache/arrow/pull/35628#discussion_r1245407884


##########
docs/source/format/Columnar.rst:
##########
@@ -350,6 +352,51 @@ will be represented as follows: ::
     |----------------|----------------------|
     | joemark        | unspecified          |
 
+Variable-size Binary View Layout
+--------------------------------
+
+Each value in this layout consists of 0 or more bytes. These characters'
+locations are indicated using a **views** buffer, which may point to one
+of potentially several **data** buffers or may contain the characters
+inline.
+
+The views buffer contains `length` view structures with the following layout:
+
+::
+
+    * Short strings, length <= 12
+      | Bytes 0-3  | Bytes 4-15                            |
+      |------------|---------------------------------------|
+      | length     | data (padded with 0)                  |
+
+    * Long strings, length > 12
+      | Bytes 0-3  | Bytes 4-7  | Bytes 8-11 | Bytes 12-15 |
+      |------------|------------|------------|-------------|
+      | length     | prefix     | buf. index | offset      |
+
+In both the long and short string cases, the first four bytes encode the

Review Comment:
   Hi, I've a question about this format.
   For StructArray[1] or FixedListArray[2], when parent is not valid, the correspond child leaves "undefined". When a child validity is valid, would it point to a undefined address?



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