jayzhan211 commented on code in PR #11989:
URL: https://github.com/apache/datafusion/pull/11989#discussion_r1720495484


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datafusion/physical-expr/src/window/built_in.rs:
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@@ -97,6 +97,10 @@ impl BuiltInWindowExpr {
 }
 
 impl WindowExpr for BuiltInWindowExpr {
+    fn func_name(&self) -> Result<&str> {
+        not_impl_err!("function name not determined")

Review Comment:
   The reason is because I don't need it -- for name checking in `nullable`



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