diff --git a/expression/builtin_math_vec.go b/expression/builtin_math_vec.go
index e2855989b3a99..bf87634e3b868 100644
--- a/expression/builtin_math_vec.go
+++ b/expression/builtin_math_vec.go
@@ -108,6 +108,24 @@ func (b *builtinAsinSig) vectorized() bool {
 	return true
 }
 
+func (b *builtinAtan1ArgSig) vecEvalReal(input *chunk.Chunk, result *chunk.Column) error {
+	if err := b.args[0].VecEvalReal(b.ctx, input, result); err != nil {
+		return err
+	}
+	f64s := result.Float64s()
+	for i := 0; i < len(f64s); i++ {
+		if result.IsNull(i) {
+			continue
+		}
+		f64s[i] = math.Atan(f64s[i])
+	}
+	return nil
+}
+
+func (b *builtinAtan1ArgSig) vectorized() bool {
+	return true
+}
+
 func (b *builtinAtan2ArgsSig) vecEvalReal(input *chunk.Chunk, result *chunk.Column) error {
 	n := input.NumRows()
 	if err := b.args[0].VecEvalReal(b.ctx, input, result); err != nil {
diff --git a/expression/builtin_math_vec_test.go b/expression/builtin_math_vec_test.go
index 02bf6b212af4b..8bae76c449878 100644
--- a/expression/builtin_math_vec_test.go
+++ b/expression/builtin_math_vec_test.go
@@ -34,6 +34,9 @@ var vecBuiltinMathCases = map[string][]vecExprBenchCase{
 	ast.Asin: {
 		{types.ETReal, []types.EvalType{types.ETReal}, nil},
 	},
+	ast.Atan: {
+		{types.ETReal, []types.EvalType{types.ETReal}, nil},
+	},
 	ast.Atan2: {
 		{types.ETReal, []types.EvalType{types.ETReal, types.ETReal}, nil},
 	},