lidavidm commented on code in PR #41646:
URL: https://github.com/apache/arrow/pull/41646#discussion_r1642225600


##########
cpp/src/arrow/engine/substrait/serde.h:
##########
@@ -183,6 +184,13 @@ ARROW_ENGINE_EXPORT Result<BoundExpressions> 
DeserializeExpressions(
     const ConversionOptions& conversion_options = {},
     ExtensionSet* ext_set_out = NULLPTR);
 
+/// \brief Deserialize a Substrait Literal message to the map
+///
+/// \param[in] buf a buffer containing the protobuf serialization of a 
Substrait Literal
+/// \param[out] out deserialize to this map.
+ARROW_ENGINE_EXPORT Status
+DeserializeMap(const Buffer& buf, std::unordered_map<std::string, 
std::string>& out);

Review Comment:
   (1) We should be using proto3. Where are we using proto2? (2) MapEntryLite 
is purely an implementation detail; the wire message should be 
google.protobuf.Struct or similar



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