westonpace commented on code in PR #18086:
URL: https://github.com/apache/datafusion/pull/18086#discussion_r2440791752
##########
datafusion/substrait/src/logical_plan/producer/expr/literal.rs:
##########
@@ -94,6 +95,36 @@ pub(crate) fn to_substrait_literal(
LiteralType::I64(*n as i64),
UNSIGNED_INTEGER_TYPE_VARIATION_REF,
),
+ ScalarValue::Float16(Some(f)) => {
+ // Following rules from
https://github.com/apache/arrow/blame/main/format/substrait/extension_types.yaml
+ // fp16 literals are encoded as user defined literals with
+ // a google.protobuf.UInt32Value message where the lower 16 bits
are
+ // the fp16 value.
+ let type_anchor =
producer.register_type(FLOAT_16_TYPE_NAME.to_string());
+
+ // Hmm, the spec says "lower 16 bits" but neglects to mention the
endianness.
+ // Let's just use little-endian for now and update the spec.
Review Comment:
Added link to https://github.com/apache/arrow/issues/47846
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