feat(fronted): cotd implementation

e2e_test/batch/functions/trigonometric_funcs.slt.part

@@ -429,5 +429,73 @@ SELECT abs(tand(-120) + -1.7320508075688772) < 0.000000000000001
 ----
 t
 
+query R
+SELECT abs(cotd(45) - 1) < 0.000000000000001;
+----
+t
+
+query R
+SELECT abs(cotd(60) - 0.5773502691896257) < 0.000000000000001;
+----
+t
+
+query R
+SELECT cotd(90);
+----
+0
+
+query R
+SELECT abs(cotd(-45) + 1) < 0.000000000000001;
+----
+t
+
+query R
+SELECT abs(cotd(-60) + 0.5773502691896257) < 0.000000000000001;
+----
+t
+
+query R
+SELECT cotd(-90);
+----
+0
+
+query R
+SELECT abs(cotd(30) - 1.7320508075688772) < 0.000000000000001;
+----
+t
 
+query R
+SELECT abs(cotd(-30) + 1.7320508075688772) < 0.000000000000001;
+----
+t
+
+
+query R
+SELECT abs(cotd(120) + 0.5773502691896255) < 0.000000000000001;
+----
+t
 
+query R
+SELECT abs(cotd(-120) - 0.5773502691896255) < 0.000000000000001;
+----
+t
+
+query R
+SELECT cotd(('-Inf'))
+----
+NaN
+
+query R
+SELECT cotd(('Inf'))
+----
+NaN
+
+query R
+SELECT cotd('NaN')
+----
+NaN
+
+query R
+SELECT cotd('-NaN')
+----
+NaN

proto/expr.proto

@@ -113,10 +113,11 @@ message ExprNode {
     ATAN2 = 252;
     SIND = 253;
     COSD = 254;
-    TAND = 255;
-    SQRT = 256;
-    DEGREES = 257;
-    RADIANS = 258;
+    COTD = 255;
+    TAND = 256;
+    SQRT = 257;
+    DEGREES = 258;
+    RADIANS = 259;
 
     // Boolean comparison
     IS_TRUE = 301;

src/expr/src/vector_op/trigonometric.rs

@@ -60,24 +60,25 @@ pub fn atan2_f64(input_x: F64, input_y: F64) -> F64 {
 static RADIANS_PER_DEGREE: f64 = 0.017_453_292_519_943_295;
 // Constants we use to get more accurate results.
 // See PSQL: https://github.com/postgres/postgres/blob/78ec02d612a9b69039ec2610740f738968fe144d/src/backend/utils/adt/float.c#L2024
-static SIN_30: f64 = 0.499_999_999_999_999_94;
-static ONE_MINUS_COS_60: f64 = 0.499_999_999_999_999_9;
-static TAN_45: f64 = 1.0;
+static SIND_30: f64 = 0.499_999_999_999_999_94;
+static ONE_MINUS_COSD_60: f64 = 0.499_999_999_999_999_9;
+static TAND_45: f64 = 1.0;
+static COTD_45: f64 = 1.0;
 
 // returns the cosine of an angle that lies between 0 and 60 degrees. This will return exactly 1
 // when xi s 0, and exactly 0.5 when x is 60 degrees.
 fn cosd_0_to_60(x: f64) -> f64 {
     // https://github.com/postgres/postgres/blob/REL_15_2/src/backend/utils/adt/float.c
     let one_minus_cos_x: f64 = 1.0 - f64::cos(x * RADIANS_PER_DEGREE);
-    1.0 - (one_minus_cos_x / ONE_MINUS_COS_60) / 2.0
+    1.0 - (one_minus_cos_x / ONE_MINUS_COSD_60) / 2.0
 }
 
 // returns the sine of an angle that lies between 0 and 30 degrees. This will return exactly 0 when
 // x is 0, and exactly 0.5 when x is 30 degrees.
 fn sind_0_to_30(x: f64) -> f64 {
     // https://github.com/postgres/postgres/blob/REL_15_2/src/backend/utils/adt/float.c
     let sin_x = f64::sin(x * RADIANS_PER_DEGREE);
-    (sin_x / SIN_30) / 2.0
+    (sin_x / SIND_30) / 2.0
 }
 
 // returns the cosine of an angle in the first quadrant (0 to 90 degrees).
@@ -184,6 +185,47 @@ pub fn sind_f64(input: F64) -> F64 {
     }
 }
 
+#[function("cotd(float64) -> float64")]
+pub fn cotd_f64(input: F64) -> F64 {
+    // PSQL implementation: https://github.com/postgres/postgres/blob/78ec02d612a9b69039ec2610740f738968fe144d/src/backend/utils/adt/float.c#L2378
+
+    // Returns NaN if input is NaN or infinite. Different from PSQL implementation.
+    if input.0.is_nan() || input.0.is_infinite() {
+        return f64::NAN.into();
+    }
+
+    let mut arg1 = input.0 % 360.0;
+    let mut sign = 1.0;
+
+    if arg1 < 0.0 {
+        // cotd(-x) = -cotd(x)
+        arg1 = -arg1;
+        sign = -sign;
+    }
+
+    if arg1 > 180.0 {
+        // cotd(360-x) = -cotd(x)
+        arg1 = 360.0 - arg1;
+        sign = -sign;
+    }
+
+    if arg1 > 90.0 {
+        // cotd(180-x) = -cotd(x)
+        arg1 = 180.0 - arg1;
+        sign = -sign;
+    }
+
+    let cot_arg1 = cosd_q1(arg1) / sind_q1(arg1);
+    let result = sign * (cot_arg1 / COTD_45);
+
+    // On some machines we get cotd(270) = minus zero, but this isn't always
+    // true. For portability, and because the user constituency for this
+    // function probably doesn't want minus zero, force it to plain zero.
+    let result = if result == 0.0 { 0.0 } else { result };
+    // Not checking for overflow because cotd(0) == Inf
+    result.into()
+}
+
 #[function("tand(float64) -> float64")]
 pub fn tand_f64(input: F64) -> F64 {
     // PSQL implementation: https://github.com/postgres/postgres/blob/REL_15_2/src/backend/utils/adt/float.c
@@ -219,7 +261,7 @@ pub fn tand_f64(input: F64) -> F64 {
     }
 
     let tan_arg1 = sind_q1(arg1) / cosd_q1(arg1);
-    let result = sign * (tan_arg1 / TAN_45);
+    let result = sign * (tan_arg1 / TAND_45);
 
     // On some machines we get tand(180) = minus zero, but this isn't always
     // true. For portability, and because the user constituency for this
@@ -240,9 +282,9 @@ pub fn radians_f64(input: F64) -> F64 {
 
 #[cfg(test)]
 mod tests {
-
     use std::f64::consts::PI;
 
+    use num_traits::Float;
     use risingwave_common::types::F64;
 
     use crate::vector_op::trigonometric::*;
@@ -300,6 +342,25 @@ mod tests {
         assert_eq!(cosd_f64(F64::from(0)).0, 1.0);
         assert_eq!(cosd_f64(F64::from(90)).0, 0.0);
 
+        // cotd
+        assert_eq!(F64::from(-f64::INFINITY), cotd_f64(d));
+        assert!(cotd_f64(F64::from(-180)).is_infinite());
+        assert!(
+            (cotd_f64(F64::from(-190)) + F64::from(5.671281819617705))
+                .abs()
+                .0
+                <= 0.00000000000001,
+        );
+        assert_similar(cot_f64(50_f64.to_radians().into()), cotd_f64(F64::from(50)));
+        assert_similar(
+            cot_f64(100_f64.to_radians().into()),
+            cotd_f64(F64::from(100)),
+        );
+        assert_similar(
+            cot_f64(250_f64.to_radians().into()),
+            cotd_f64(F64::from(250)),
+        );
+
         // tand
         assert_similar(
             tan_f64((-10_f64).to_radians().into()),

src/frontend/src/binder/expr/function.rs

@@ -367,6 +367,7 @@ impl Binder {
                 ("atan2", raw_call(ExprType::Atan2)),
                 ("sind", raw_call(ExprType::Sind)),
                 ("cosd", raw_call(ExprType::Cosd)),
+                ("cotd", raw_call(ExprType::Cotd)),
                 ("tand", raw_call(ExprType::Tand)),
                 ("degrees", raw_call(ExprType::Degrees)),
                 ("radians", raw_call(ExprType::Radians)),

src/frontend/src/expr/pure.rs

@@ -150,8 +150,9 @@ impl ExprVisitor<bool> for ImpureAnalyzer {
             | expr_node::Type::Pi
             | expr_node::Type::Sind
             | expr_node::Type::Cosd
-            | expr_node::Type::Encode
+            | expr_node::Type::Cotd
             | expr_node::Type::Decode
+            | expr_node::Type::Encode
             | expr_node::Type::Tand
             | expr_node::Type::ArrayPositions
             | expr_node::Type::StringToArray =>