Allow a model to take multiple arguments (#2890)

lib/src/sql/model.rs

@@ -19,9 +19,9 @@ use crate::{
 };
 
 use super::{
-	common::{closechevron, closeparentheses, openchevron, openparentheses, val_char},
+	common::{closechevron, closeparentheses, commas, openchevron, openparentheses, val_char},
 	error::{expect_tag_no_case, expected},
-	util::expect_delimited,
+	util::{delimited_list1, expect_delimited},
 	value::value,
 };
 
@@ -30,12 +30,19 @@ use super::{
 pub struct Model {
 	pub name: String,
 	pub version: String,
-	pub parameters: Value,
+	pub args: Vec<Value>,
 }
 
 impl fmt::Display for Model {
 	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		write!(f, "ml::{}<{}>({})", self.name, self.version, self.parameters)
+		write!(f, "ml::{}<{}>(", self.name, self.version)?;
+		for (idx, p) in self.args.iter().enumerate() {
+			if idx != 0 {
+				write!(f, ",")?;
+			}
+			write!(f, "{}", p)?;
+		}
+		write!(f, ")")
 	}
 }
 
@@ -62,9 +69,9 @@ pub fn model(i: &str) -> IResult<&str, Model> {
 		let (i, version) =
 			expected("a version", expect_delimited(openchevron, version, closechevron))(i)?;
 
-		let (i, parameters) = expected(
-			"model parameters",
-			expect_delimited(openparentheses, value, closeparentheses),
+		let (i, args) = expected(
+			"model arguments",
+			delimited_list1(openparentheses, commas, value, closeparentheses),
 		)(i)?;
 
 		Ok((
@@ -72,7 +79,7 @@ pub fn model(i: &str) -> IResult<&str, Model> {
 			Model {
 				name: name.to_owned(),
 				version,
-				parameters,
+				args,
 			},
 		))
 	})(i)
@@ -130,4 +137,12 @@ mod test {
 			out,
 		);
 	}
+
+	#[test]
+	fn ml_model_with_mutiple_arguments() {
+		let sql = "ml::insurance::prediction<1.0.0>(1,2,3,4,);";
+		let res = query::query(sql);
+		let out = res.unwrap().1.to_string();
+		assert_eq!("ml::insurance::prediction<1.0.0>(1,2,3,4);", out,);
+	}
 }

lib/src/sql/value/value.rs

@@ -2582,7 +2582,7 @@ impl Value {
 			Value::Function(v) => {
 				v.is_custom() || v.is_script() || v.args().iter().any(Value::writeable)
 			}
-			Value::MlModel(m) => m.parameters.writeable(),
+			Value::MlModel(m) => m.args.iter().any(Value::writeable),
 			Value::Subquery(v) => v.writeable(),
 			Value::Expression(v) => v.writeable(),
 			_ => false,