davidwendt commented on code in PR #43234:
URL: https://github.com/apache/arrow/pull/43234#discussion_r1683324340
##########
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:
Just for clarification on libcudf. The comparator referenced resolves the
BOOL8 value to a C/C++ `bool` variable before calling the comparator and so
follows the same semantics that a non-zero bool compares equal to another
non-zero bool (nicely illustrated in the godbolt link here).
The magic is in the `column_device_view::element()` method which when called
through with the type-dispatcher maps a `BOOL8` column type to a native `bool`
type when reading the column row data from memory.
So libcudf does not require the bool8 values to be normalized to [0,1] but
relies on the underlying behavior of C++ `bool` type.
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