lidavidm commented on code in PR #41646:
URL: https://github.com/apache/arrow/pull/41646#discussion_r1642611813
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cpp/src/arrow/engine/substrait/serde.h:
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@@ -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:
Either way: I'm not comfortable with the current approach. It exposes new
public APIs that are specific to Dataset and should not be public, and I'm
skeptical of encoding our custom Dataset options into Substrait in the first
place.
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