alamb commented on code in PR #13201:
URL: https://github.com/apache/datafusion/pull/13201#discussion_r1840604599


##########
datafusion/physical-plan/Cargo.toml:
##########
@@ -70,6 +70,7 @@ tokio = { workspace = true }
 [dev-dependencies]
 criterion = { version = "0.5", features = ["async_futures"] }
 datafusion-functions-aggregate = { workspace = true }
+datafusion-functions-window = { workspace = true }

Review Comment:
   some day I hope we can remove these dependencies (so we can make testing 
`physical-plan` faster, but not a part of this PR



##########
datafusion/physical-plan/src/windows/mod.rs:
##########
@@ -241,14 +171,29 @@ fn create_udwf_window_expr(
         .map(|arg| arg.data_type(input_schema))
         .collect::<Result<_>>()?;
 
-    Ok(Arc::new(WindowUDFExpr {
+    let udwf_expr = Arc::new(WindowUDFExpr {
         fun: Arc::clone(fun),
         args: args.to_vec(),
         input_types,
         name,
         is_reversed: false,
         ignore_nulls,
-    }))
+    });
+
+    // Early validation of input expressions
+    // We create a partition evaluator because in the user-defined window
+    // implementation this is where code for parsing input expressions
+    // exist. The benefits are:
+    // - If any of the input expressions are invalid we catch them early

Review Comment:
   💯  for these comments that explain the rationale



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