feat: sync functions, remove holt_winters, add start/end/range/step

Author: sunng87

src/parser/function.rs

@@ -247,6 +247,13 @@ lazy_static! {
             ValueType::Vector,
             false
         ),
+        function!(
+            "end",
+            vec![],
+            0,
+            ValueType::Scalar,
+            true
+        ),
         function!("exp", vec![ValueType::Vector], 0, ValueType::Vector, false),
         function!(
             "first_over_time",
@@ -337,13 +344,6 @@ lazy_static! {
             ValueType::Vector,
             true
         ),
-        function!(
-            "holt_winters",
-            vec![ValueType::Matrix, ValueType::Scalar, ValueType::Scalar],
-            0,
-            ValueType::Vector,
-            false
-        ),
         function!("hour", vec![ValueType::Vector], 1, ValueType::Vector, false),
         function!(
             "idelta",
@@ -471,6 +471,13 @@ lazy_static! {
             false
         ),
         function!("pi", vec![], 0, ValueType::Scalar, false),
+        function!(
+            "range",
+            vec![],
+            0,
+            ValueType::Scalar,
+            true
+        ),
         function!(
             "predict_linear",
             vec![ValueType::Matrix, ValueType::Scalar],
@@ -516,6 +523,20 @@ lazy_static! {
             false
         ),
         function!("sgn", vec![ValueType::Vector], 0, ValueType::Vector, false),
+        function!(
+            "start",
+            vec![],
+            0,
+            ValueType::Scalar,
+            true
+        ),
+        function!(
+            "step",
+            vec![],
+            0,
+            ValueType::Scalar,
+            true
+        ),
         function!("sin", vec![ValueType::Vector], 0, ValueType::Vector, false),
         function!("sinh", vec![ValueType::Vector], 0, ValueType::Vector, false),
         function!("sort", vec![ValueType::Vector], 0, ValueType::Vector, false),

src/parser/parse.rs

@@ -1344,20 +1344,6 @@ mod tests {
                     )
                 })
             }),
-            ("holt_winters(some_metric[5m], 0.5, 0.1)", {
-                Expr::new_matrix_selector(
-                    Expr::from(VectorSelector::from("some_metric")),
-                    duration::MINUTE_DURATION * 5,
-                )
-                .and_then(|ex| {
-                    Expr::new_call(
-                        get_function("holt_winters").unwrap(),
-                        FunctionArgs::new_args(ex)
-                            .append_args(Expr::from(0.5))
-                            .append_args(Expr::from(0.1)),
-                    )
-                })
-            }),
             // cases from https://prometheus.io/docs/prometheus/latest/querying/functions
             (r#"absent(nonexistent{job="myjob"})"#, {
                 let name = String::from("nonexistent");