comphead commented on code in PR #16391:
URL: https://github.com/apache/datafusion/pull/16391#discussion_r2147446520


##########
datafusion/functions-table/src/generate_series.rs:
##########
@@ -197,11 +197,18 @@ impl TableFunctionImpl for GenerateSeriesFuncImpl {
         }
 
         let mut normalize_args = Vec::new();
-        for expr in exprs {
+        for (expr_index, expr) in exprs.iter().enumerate() {
             match expr {
                 Expr::Literal(ScalarValue::Null, _) => {}
                 Expr::Literal(ScalarValue::Int64(Some(n)), _) => 
normalize_args.push(*n),
-                _ => return plan_err!("First argument must be an integer 
literal"),
+                other => {
+                    return plan_err!(
+                        "Argument #{} must be an integer literal or null 
value, got {} ({:?})",
+                        expr_index + 1,
+                        other,

Review Comment:
   yeah, I'm checking the message in the slt test
   ```
   got Utf8\("foo"\) \(Literal\(Utf8\("foo"\), None\)\)
   ```
   would be that self explanatory to keep the last one only? 



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