LucaCappelletti94 commented on code in PR #2301:
URL: 
https://github.com/apache/datafusion-sqlparser-rs/pull/2301#discussion_r3124412828


##########
src/ast/mod.rs:
##########
@@ -1332,6 +1332,12 @@ pub enum Expr {
     Lambda(LambdaFunction),
     /// Checks membership of a value in a JSON array
     MemberOf(MemberOf),
+    /// PostgreSQL `XMLCONCAT(xml[, ...])` — concatenates a list of
+    /// individual XML values to create a single value containing an
+    /// XML content fragment.
+    ///
+    /// 
[PostgreSQL](https://www.postgresql.org/docs/current/functions-xml.html#FUNCTIONS-PRODUCING-XML-XMLCONCAT)
+    XmlConcat(Vec<Expr>),

Review Comment:
   It can be parsed as a function, I added it to the enum nevertheless for easy 
of use, for the same reason that other functions like CEIL for instance appear 
there. Of course, open to discussion whether it is worth it. 



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