paleolimbot commented on code in PR #43234:
URL: https://github.com/apache/arrow/pull/43234#discussion_r1681246547
##########
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:
+
+ * **false** is denoted by the value ``0``.
+ * **true** can be specified using any non-zero value.
Review Comment:
I still like "Producers SHOULD produce 0 or 1 values. Consumers MUST treat
any non-zero value as true and 0 as false.", which makes it clear that
consumers must not assume that values are either 0 or 1 and that producers
should not validate the 0/1-ness of their output (at the point they have to do
this, they may as well bitpack it and produce a regular bool).
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