From 9fc7ba33aa57c1bd46a795370261cd6c8aababf4 Mon Sep 17 00:00:00 2001
From: Levi Harrison <git@leviharrison.dev>
Date: Tue, 24 Aug 2021 07:28:22 -0400
Subject: [PATCH] Remove `atan2()`

Signed-off-by: Levi Harrison <git@leviharrison.dev>
---
 promql/functions.go        | 14 --------------
 promql/parser/functions.go |  5 -----
 2 files changed, 19 deletions(-)

diff --git a/promql/functions.go b/promql/functions.go
index 746dd3fd58..31f359ce3c 100644
--- a/promql/functions.go
+++ b/promql/functions.go
@@ -600,19 +600,6 @@ func funcAtan(vals []parser.Value, args parser.Expressions, enh *EvalNodeHelper)
 	return simpleFunc(vals, enh, math.Atan)
 }
 
-// === atan2(Vector1, Vector2 parser.ValueTypeVector) Vector ===
-func funcAtan2(vals []parser.Value, args parser.Expressions, enh *EvalNodeHelper) Vector {
-	y := vals[0].(Vector)
-	x := vals[1].(Vector)
-
-	for i := 0; i < len(y); i++ {
-		enh.Out = append(enh.Out, Sample{
-			Point: Point{V: math.Atan2(y[i].V, x[i].V)},
-		})
-	}
-	return enh.Out
-}
-
 // === rad(Vector parser.ValueTypeVector) Vector ===
 func funcRad(vals []parser.Value, args parser.Expressions, enh *EvalNodeHelper) Vector {
 	return simpleFunc(vals, enh, func(v float64) float64 {
@@ -1002,7 +989,6 @@ var FunctionCalls = map[string]FunctionCall{
 	"acos":               funcAcos,
 	"asin":               funcAsin,
 	"atan":               funcAtan,
-	"atan2":              funcAtan2,
 	"avg_over_time":      funcAvgOverTime,
 	"ceil":               funcCeil,
 	"changes":            funcChanges,
diff --git a/promql/parser/functions.go b/promql/parser/functions.go
index 3fe8d22aa6..11a49e2fbe 100644
--- a/promql/parser/functions.go
+++ b/promql/parser/functions.go
@@ -54,11 +54,6 @@ var Functions = map[string]*Function{
 		ArgTypes:   []ValueType{ValueTypeVector},
 		ReturnType: ValueTypeVector,
 	},
-	"atan2": {
-		Name:       "atan2",
-		ArgTypes:   []ValueType{ValueTypeVector, ValueTypeVector},
-		ReturnType: ValueTypeVector,
-	},
 	"avg_over_time": {
 		Name:       "avg_over_time",
 		ArgTypes:   []ValueType{ValueTypeMatrix},