feat(core): support to define param_names and param_types in the list file

wren-core-py/src/remote_functions.rs

@@ -28,8 +28,10 @@ pub struct PyRemoteFunction {
     pub function_type: String,
     pub name: String,
     pub return_type: Option<String>,
-    pub param_names: Option<Vec<String>>,
-    pub param_types: Option<Vec<String>>,
+    /// It's a comma separated string of parameter names
+    pub param_names: Option<String>,
+    /// It's a comma separated string of parameter types
+    pub param_types: Option<String>,
     pub description: Option<String>,
 }
 
@@ -54,12 +56,26 @@ impl PyRemoteFunction {
 
 impl From<wren_core::mdl::function::RemoteFunction> for PyRemoteFunction {
     fn from(remote_function: wren_core::mdl::function::RemoteFunction) -> Self {
+        let param_names = remote_function.param_names.map(|names| {
+            names
+                .iter()
+                .map(|name| name.to_string())
+                .collect::<Vec<String>>()
+                .join(",")
+        });
+        let param_types = remote_function.param_types.map(|types| {
+            types
+                .iter()
+                .map(|t| t.to_string())
+                .collect::<Vec<String>>()
+                .join(",")
+        });
         Self {
             function_type: remote_function.function_type.to_string(),
             name: remote_function.name,
             return_type: Some(remote_function.return_type),
-            param_names: remote_function.param_names,
-            param_types: remote_function.param_types,
+            param_names,
+            param_types,
             description: remote_function.description,
         }
     }
@@ -69,14 +85,26 @@ impl From<PyRemoteFunction> for wren_core::mdl::function::RemoteFunction {
     fn from(
         remote_function: PyRemoteFunction,
     ) -> wren_core::mdl::function::RemoteFunction {
+        let param_names = remote_function.param_names.map(|names| {
+            names
+                .split(",")
+                .map(|name| name.to_string())
+                .collect::<Vec<String>>()
+        });
+        let param_types = remote_function.param_types.map(|types| {
+            types
+                .split(",")
+                .map(|t| t.to_string())
+                .collect::<Vec<String>>()
+        });
         wren_core::mdl::function::RemoteFunction {
             function_type: FunctionType::from_str(&remote_function.function_type)
                 .unwrap(),
             name: remote_function.name,
             // TODO: Get the return type form DataFusion SessionState
             return_type: remote_function.return_type.unwrap_or("string".to_string()),
-            param_names: remote_function.param_names,
-            param_types: remote_function.param_types,
+            param_names,
+            param_types,
             description: remote_function.description,
         }
     }

wren-core-py/tests/functions.csv

@@ -1,3 +1,3 @@
-function_type,name,return_type,description
-scalar,add_two,int,"Adds two numbers together."
-window,max_if,int,"If the condition is true, returns the maximum value in the window."
+function_type,name,return_type,param_names,param_types,description
+scalar,add_two,int,"f1,f2","int,int","Adds two numbers together."
+window,max_if,int,,,"If the condition is true, returns the maximum value in the window."

wren-core-py/tests/test_modeling_core.py

@@ -63,3 +63,13 @@ def test_get_available_functions():
     assert add_two["name"] == "add_two"
     assert add_two["function_type"] == "scalar"
     assert add_two["description"] == "Adds two numbers together."
+    assert add_two["return_type"] == "int"
+    assert add_two["param_names"] == "f1,f2"
+    assert add_two["param_types"] == "int,int"
+
+    max_if = next(filter(lambda x: x["name"] == "max_if", map(lambda x: x.to_dict(), functions)))
+    assert max_if["name"] == "max_if"
+    assert max_if["function_type"] == "window"
+    assert max_if["param_names"] is None
+    assert max_if["param_types"] is None
+