fix(duckdb): use the UDF's signature instead of arguments' output type for generating a duckdb signature

Author: cpcloud

ibis/backends/duckdb/__init__.py

@@ -1272,7 +1272,10 @@ def _register_udfs(self, expr: ir.Expr) -> None:
     def _compile_udf(self, udf_node: ops.ScalarUDF) -> None:
         func = udf_node.__func__
         name = func.__name__
-        input_types = [DuckDBType.to_string(arg.dtype) for arg in udf_node.args]
+        input_types = [
+            DuckDBType.to_string(param.annotation.pattern.dtype)
+            for param in udf_node.__signature__.parameters.values()
+        ]
         output_type = DuckDBType.to_string(udf_node.dtype)
 
         def register_udf(con):