felipecrv commented on code in PR #43234:
URL: https://github.com/apache/arrow/pull/43234#discussion_r1681392208
##########
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:
If someone finds a bug in a kernel because it assumed `[0, 1]` range and the
`Bool8` array contains values out of the range, it's the producer that is
violating the spec.
I believe systems that use bytes for bools are already normalized to `[0,
1]` so `MUST` should be a requirement on producers. It should not affect
zero-copy ability.
And zero-copy goes both ways. Systems have both producers and consumers of
arrays. The way to order the requirements can never be perfect, but it can at
least be compatible with the existing semantics adopted in programming
languages and CPUs.
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