fix(cubesql): Parse UDAF name in LogicalPlanLanguage

Author: mcheshkov

rust/cubesql/cubesql/src/compile/rewrite/language.rs

@@ -261,8 +261,12 @@ macro_rules! variant_field_struct {
 
             impl FromStr for [<$variant $var_field:camel>] {
                 type Err = $crate::compile::rewrite::language::LanguageParseError;
-                fn from_str(_s: &str) -> Result<Self, Self::Err> {
-                    Err(Self::Err::NotSupported)
+                fn from_str(s: &str) -> Result<Self, Self::Err> {
+                    const PREFIX: &'static str = concat!(std::stringify!([<$variant $var_field:camel>]), ":");
+                    if let Some(suffix) =  s.strip_prefix(PREFIX) {
+                        return Ok([<$variant $var_field:camel>](suffix.to_string()));
+                    }
+                    Err(Self::Err::ShouldStartWith(PREFIX))
                 }
             }
 

rust/cubesql/cubesql/src/compile/rewrite/mod.rs

@@ -1419,9 +1419,13 @@ fn window_fun_expr_var_arg(
 }
 
 fn udaf_expr(fun_name: impl Display, args: Vec<impl Display>) -> String {
+    let prefix = if fun_name.to_string().starts_with("?") {
+        ""
+    } else {
+        "AggregateUDFExprFun:"
+    };
     format!(
-        "(AggregateUDFExpr {} {})",
-        fun_name,
+        "(AggregateUDFExpr {prefix}{fun_name} {})",
         list_expr("AggregateUDFExprArgs", args),
     )
 }