waynexia commented on code in PR #10646:
URL: https://github.com/apache/datafusion/pull/10646#discussion_r1617168485


##########
datafusion/substrait/src/logical_plan/consumer.rs:
##########
@@ -1160,6 +1162,24 @@ pub(crate) fn from_substrait_type(dt: 
&substrait::proto::Type) -> Result<DataTyp
                     "Unsupported Substrait type variation {v} of type 
{s_kind:?}"
                 ),
             },
+            r#type::Kind::UserDefined(u) => {
+                match u.type_reference {
+                    INTERVAL_YEAR_MONTH_TYPE_REF => {

Review Comment:
   There are two "references":
   
   
https://github.com/apache/datafusion/pull/10646/files#diff-d1c5f4c37ac8286d2045acb61bee17382179469557132eb02844413b260ae41bR1440-R1441
   
   To my understanding, type variation (like 
[these](https://github.com/apache/datafusion/pull/10646/files#diff-c7934d272ebcb8a37036a33903e38204a4448dc35f31fea712b4ba9086c12c42R29-R40))
 are for different types from *one base type*. And type references (like 
[these](https://github.com/apache/datafusion/pull/10646/files#diff-c7934d272ebcb8a37036a33903e38204a4448dc35f31fea712b4ba9086c12c42R42-R78))
 are for different base types, those user-defined types.
   
   I'll submit a patch to add document for the usage tomorrow.



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