joellubi commented on code in PR #43234:
URL: https://github.com/apache/arrow/pull/43234#discussion_r1682707778
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -283,6 +283,28 @@ UUID
A specific UUID version is not required or guaranteed. This extension
represents
UUIDs as FixedSizeBinary(16) with big-endian notation and does not
interpret the bytes in any way.
+8-bit Boolean
+=============
+
+Bool8 represents a boolean value using 1 byte (8 bits) to store each value
instead of only 1 bit as in
+the native Arrow Boolean type. Although less compact that the native
representation, Bool8 may have
+better zero-copy compatibility with various systems that also store booleans
using 1 byte.
+
+* Extension name: ``arrow.bool8``.
+
+* The storage type of this extension is ``Int8`` where:
Review Comment:
Hi @AlenkaF, either would work but `int8` was chosen for easier
multi-language support. There are a few places in the Arrow docs that suggest
this, such as the entry for [dictionary
indices](https://arrow.apache.org/docs/format/Columnar.html#dictionary-encoded-layout):
> Since unsigned integers can be more difficult to work with in some cases
(e.g. in the JVM), we recommend preferring signed integers over unsigned
integers for representing dictionary indices. Additionally, we recommend
avoiding using 64-bit unsigned integer indices unless they are required by an
application.
The same principles will likely make `Bool8` work better on the JVM if it's
represented with signed integers.
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