feat: Implement PI Function

AmrDeveloper · Nov 6, 2023 · baf278f · baf278f
1 parent 0e6cb4f
commit baf278f
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diff --git a/crates/gitql-ast/src/function.rs b/crates/gitql-ast/src/function.rs
@@ -46,6 +46,9 @@ lazy_static! {
         map.insert("now", date_current_timestamp);
         map.insert("makedate", date_make_date);
 
+        // Numeric functions
+        map.insert("pi", numeric_pi);
+
         // Other Functions
         map.insert("isnull", general_is_null);
         map.insert("isnumeric", general_is_numeric);
@@ -248,6 +251,14 @@ lazy_static! {
                 result: DataType::Date,
             },
         );
+        // Numeric functions
+        map.insert(
+            "pi",
+            Prototype {
+                parameters: vec![],
+                result: DataType::Float,
+            },
+        );
         // General functions
         map.insert(
             "isnull",
@@ -513,6 +524,13 @@ fn date_make_date(inputs: Vec<Value>) -> Value {
     Value::Date(time_stamp)
 }
 
+// Numeric functions
+
+fn numeric_pi(_inputs: Vec<Value>) -> Value {
+    let pi = std::f64::consts::PI;
+    Value::Float(pi)
+}
+
 // General functions
 
 fn general_is_null(inputs: Vec<Value>) -> Value {

diff --git a/docs/function/functions.md b/docs/function/functions.md
@@ -71,6 +71,20 @@ SELECT MAKEDATE(2023, 12)
 SELECT NOW()
 ```
 
+### Numeric Functions
+
+| Name | Paramters | Return | Description             |
+| ---- | --------- | ------ | ----------------------- |
+| PI   |           | Float  | Return the value of PI. |
+
+### Numeric functions samples
+
+```sql
+
+SELECT PI()
+
+``````
+
 ### General functions
 
 | Name      | Paramters | Return  | Description                                 |