refactor: move acos() to function crate

datafusion/expr/src/built_in_function.rs

@@ -42,8 +42,6 @@ use strum_macros::EnumIter;
 #[derive(Debug, Clone, PartialEq, Eq, Hash, EnumIter, Copy)]
 pub enum BuiltinScalarFunction {
     // math functions
-    /// acos
-    Acos,
     /// asin
     Asin,
     /// atan
@@ -362,7 +360,6 @@ impl BuiltinScalarFunction {
     pub fn volatility(&self) -> Volatility {
         match self {
             // Immutable scalar builtins
-            BuiltinScalarFunction::Acos => Volatility::Immutable,
             BuiltinScalarFunction::Asin => Volatility::Immutable,
             BuiltinScalarFunction::Atan => Volatility::Immutable,
             BuiltinScalarFunction::Atan2 => Volatility::Immutable,
@@ -873,8 +870,7 @@ impl BuiltinScalarFunction {
                 utf8_to_int_type(&input_expr_types[0], "levenshtein")
             }
 
-            BuiltinScalarFunction::Acos
-            | BuiltinScalarFunction::Asin
+            BuiltinScalarFunction::Asin
             | BuiltinScalarFunction::Atan
             | BuiltinScalarFunction::Acosh
             | BuiltinScalarFunction::Asinh
@@ -1346,8 +1342,7 @@ impl BuiltinScalarFunction {
                 vec![Exact(vec![Utf8, Utf8]), Exact(vec![LargeUtf8, LargeUtf8])],
                 self.volatility(),
             ),
-            BuiltinScalarFunction::Acos
-            | BuiltinScalarFunction::Asin
+            BuiltinScalarFunction::Asin
             | BuiltinScalarFunction::Atan
             | BuiltinScalarFunction::Acosh
             | BuiltinScalarFunction::Asinh
@@ -1438,7 +1433,6 @@ impl BuiltinScalarFunction {
     /// Returns all names that can be used to call this function
     pub fn aliases(&self) -> &'static [&'static str] {
         match self {
-            BuiltinScalarFunction::Acos => &["acos"],
             BuiltinScalarFunction::Acosh => &["acosh"],
             BuiltinScalarFunction::Asin => &["asin"],
             BuiltinScalarFunction::Asinh => &["asinh"],

datafusion/expr/src/expr_fn.rs

@@ -531,7 +531,6 @@ scalar_expr!(Sinh, sinh, num, "hyperbolic sine");
 scalar_expr!(Cosh, cosh, num, "hyperbolic cosine");
 scalar_expr!(Tanh, tanh, num, "hyperbolic tangent");
 scalar_expr!(Asin, asin, num, "inverse sine");
-scalar_expr!(Acos, acos, num, "inverse cosine");
 scalar_expr!(Atan, atan, num, "inverse tangent");
 scalar_expr!(Asinh, asinh, num, "inverse hyperbolic sine");
 scalar_expr!(Acosh, acosh, num, "inverse hyperbolic cosine");
@@ -1339,7 +1338,6 @@ mod test {
         test_unary_scalar_expr!(Cosh, cosh);
         test_unary_scalar_expr!(Tanh, tanh);
         test_unary_scalar_expr!(Asin, asin);
-        test_unary_scalar_expr!(Acos, acos);
         test_unary_scalar_expr!(Atan, atan);
         test_unary_scalar_expr!(Asinh, asinh);
         test_unary_scalar_expr!(Acosh, acosh);

datafusion/functions/src/math/acos.rs

@@ -0,0 +1,110 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Math function: `acos()`.
+
+use arrow::array::{ArrayRef, Float32Array, Float64Array};
+use arrow::datatypes::DataType;
+use datafusion_common::{exec_err, plan_datafusion_err, DataFusionError, Result};
+use datafusion_expr::ColumnarValue;
+use datafusion_expr::{
+    utils::generate_signature_error_msg, ScalarUDFImpl, Signature, Volatility,
+};
+use std::any::Any;
+use std::sync::Arc;
+
+#[derive(Debug)]
+pub struct AcosFunc {
+    signature: Signature,
+}
+
+impl AcosFunc {
+    pub fn new() -> Self {
+        use DataType::*;
+        Self {
+            signature: Signature::uniform(
+                1,
+                vec![Float64, Float32],
+                Volatility::Immutable,
+            ),
+        }
+    }
+}
+
+impl ScalarUDFImpl for AcosFunc {
+    fn as_any(&self) -> &dyn Any {
+        self
+    }
+    fn name(&self) -> &str {
+        "acos"
+    }
+
+    fn signature(&self) -> &Signature {
+        &self.signature
+    }
+
+    fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> {
+        if arg_types.len() != 1 {
+            return Err(plan_datafusion_err!(
+                "{}",
+                generate_signature_error_msg(
+                    self.name(),
+                    self.signature().clone(),
+                    arg_types,
+                )
+            ));
+        }
+
+        let arg_type = &arg_types[0];
+
+        match arg_type {
+            DataType::Float64 => Ok(DataType::Float64),
+            DataType::Float32 => Ok(DataType::Float32),
+
+            // For other types (possible values null/int), use Float 64
+            _ => Ok(DataType::Float64),
+        }
+    }
+
+    fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
+        let args = ColumnarValue::values_to_arrays(args)?;
+
+        let arr: ArrayRef = match args[0].data_type() {
+            DataType::Float64 => Arc::new(make_function_scalar_inputs_return_type!(
+                &args[0],
+                self.name(),
+                Float64Array,
+                Float64Array,
+                { f64::acos }
+            )),
+            DataType::Float32 => Arc::new(make_function_scalar_inputs_return_type!(
+                &args[0],
+                self.name(),
+                Float32Array,
+                Float32Array,
+                { f32::acos }
+            )),
+            other => {
+                return exec_err!(
+                    "Unsupported data type {other:?} for function {}",
+                    self.name()
+                )
+            }
+        };
+        Ok(ColumnarValue::Array(arr))
+    }
+}

datafusion/functions/src/math/mod.rs

@@ -17,15 +17,26 @@
 
 //! "math" DataFusion functions
 
-mod nans;
 mod abs;
+mod acos;
+mod nans;
 
 // create  UDFs
 make_udf_function!(nans::IsNanFunc, ISNAN, isnan);
 make_udf_function!(abs::AbsFunc, ABS, abs);
+make_udf_function!(acos::AcosFunc, ACOS, acos);
 
 // Export the functions out of this package, both as expr_fn as well as a list of functions
 export_functions!(
-    (isnan, num, "returns true if a given number is +NaN or -NaN otherwise returns false"),
-    (abs, num, "returns the absolute value of a given number")
-);
+    (
+        isnan,
+        num,
+        "returns true if a given number is +NaN or -NaN otherwise returns false"
+    ),
+    (abs, num, "returns the absolute value of a given number"),
+    (
+        acos,
+        num,
+        "returns the arc cosine or inverse cosine of a number"
+    )
+);

datafusion/functions/src/math/nans.rs

@@ -15,7 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
-//! Encoding expressions
+//! Math function: `isnan()`.
 
 use arrow::datatypes::DataType;
 use datafusion_common::{exec_err, DataFusionError, Result};

datafusion/optimizer/src/analyzer/type_coercion.rs

@@ -889,14 +889,14 @@ mod test {
         // test that automatic argument type coercion for scalar functions work
         let empty = empty();
         let lit_expr = lit(10i64);
-        let fun: BuiltinScalarFunction = BuiltinScalarFunction::Acos;
+        let fun: BuiltinScalarFunction = BuiltinScalarFunction::Floor;
         let scalar_function_expr =
             Expr::ScalarFunction(ScalarFunction::new(fun, vec![lit_expr]));
         let plan = LogicalPlan::Projection(Projection::try_new(
             vec![scalar_function_expr],
             empty,
         )?);
-        let expected = "Projection: acos(CAST(Int64(10) AS Float64))\n  EmptyRelation";
+        let expected = "Projection: floor(CAST(Int64(10) AS Float64))\n  EmptyRelation";
         assert_analyzed_plan_eq(Arc::new(TypeCoercion::new()), &plan, expected)
     }
 

datafusion/physical-expr/src/functions.rs

@@ -261,7 +261,6 @@ pub fn create_physical_fun(
 ) -> Result<ScalarFunctionImplementation> {
     Ok(match fun {
         // math functions
-        BuiltinScalarFunction::Acos => Arc::new(math_expressions::acos),
         BuiltinScalarFunction::Asin => Arc::new(math_expressions::asin),
         BuiltinScalarFunction::Atan => Arc::new(math_expressions::atan),
         BuiltinScalarFunction::Acosh => Arc::new(math_expressions::acosh),

datafusion/proto/proto/datafusion.proto

@@ -548,7 +548,7 @@ enum ScalarFunction {
   //  0 was Abs before
   //  The first enum value must be zero for open enums
   unknown = 0;
-  Acos = 1;
+  //  1 was Acos
   Asin = 2;
   Atan = 3;
   Ascii = 4;

datafusion/proto/src/logical_plan/from_proto.rs

@@ -47,15 +47,15 @@ use datafusion_common::{
 use datafusion_expr::expr::Unnest;
 use datafusion_expr::window_frame::{check_window_frame, regularize_window_order_by};
 use datafusion_expr::{
-    acos, acosh, array, array_append, array_concat, array_dims, array_distinct,
-    array_element, array_empty, array_except, array_has, array_has_all, array_has_any,
-    array_intersect, array_length, array_ndims, array_pop_back, array_pop_front,
-    array_position, array_positions, array_prepend, array_remove, array_remove_all,
-    array_remove_n, array_repeat, array_replace, array_replace_all, array_replace_n,
-    array_resize, array_slice, array_sort, array_union, arrow_typeof, ascii, asin, asinh,
-    atan, atan2, atanh, bit_length, btrim, cardinality, cbrt, ceil, character_length,
-    chr, coalesce, concat_expr, concat_ws_expr, cos, cosh, cot, current_date,
-    current_time, date_bin, date_part, date_trunc, degrees, digest, ends_with, exp,
+    acosh, array, array_append, array_concat, array_dims, array_distinct, array_element,
+    array_empty, array_except, array_has, array_has_all, array_has_any, array_intersect,
+    array_length, array_ndims, array_pop_back, array_pop_front, array_position,
+    array_positions, array_prepend, array_remove, array_remove_all, array_remove_n,
+    array_repeat, array_replace, array_replace_all, array_replace_n, array_resize,
+    array_slice, array_sort, array_union, arrow_typeof, ascii, asin, asinh, atan, atan2,
+    atanh, bit_length, btrim, cardinality, cbrt, ceil, character_length, chr, coalesce,
+    concat_expr, concat_ws_expr, cos, cosh, cot, current_date, current_time, date_bin,
+    date_part, date_trunc, degrees, digest, ends_with, exp,
     expr::{self, InList, Sort, WindowFunction},
     factorial, find_in_set, flatten, floor, from_unixtime, gcd, gen_range, initcap,
     instr, iszero, lcm, left, levenshtein, ln, log, log10, log2,
@@ -450,7 +450,6 @@ impl From<&protobuf::ScalarFunction> for BuiltinScalarFunction {
             ScalarFunction::Tan => Self::Tan,
             ScalarFunction::Cot => Self::Cot,
             ScalarFunction::Asin => Self::Asin,
-            ScalarFunction::Acos => Self::Acos,
             ScalarFunction::Atan => Self::Atan,
             ScalarFunction::Sinh => Self::Sinh,
             ScalarFunction::Cosh => Self::Cosh,
@@ -1362,7 +1361,6 @@ pub fn parse_expr(
             match scalar_function {
                 ScalarFunction::Unknown => Err(proto_error("Unknown scalar function")),
                 ScalarFunction::Asin => Ok(asin(parse_expr(&args[0], registry)?)),
-                ScalarFunction::Acos => Ok(acos(parse_expr(&args[0], registry)?)),
                 ScalarFunction::Asinh => Ok(asinh(parse_expr(&args[0], registry)?)),
                 ScalarFunction::Acosh => Ok(acosh(parse_expr(&args[0], registry)?)),
                 ScalarFunction::Array => Ok(array(

datafusion/proto/src/logical_plan/to_proto.rs

@@ -1432,7 +1432,6 @@ impl TryFrom<&BuiltinScalarFunction> for protobuf::ScalarFunction {
             BuiltinScalarFunction::Cosh => Self::Cosh,
             BuiltinScalarFunction::Tanh => Self::Tanh,
             BuiltinScalarFunction::Asin => Self::Asin,
-            BuiltinScalarFunction::Acos => Self::Acos,
             BuiltinScalarFunction::Atan => Self::Atan,
             BuiltinScalarFunction::Asinh => Self::Asinh,
             BuiltinScalarFunction::Acosh => Self::Acosh,

datafusion/proto/tests/cases/roundtrip_physical_plan.rs

@@ -16,10 +16,6 @@
 // under the License.
 
 use arrow::csv::WriterBuilder;
-use std::ops::Deref;
-use std::sync::Arc;
-use std::vec;
-
 use datafusion::arrow::array::ArrayRef;
 use datafusion::arrow::compute::kernels::sort::SortOptions;
 use datafusion::arrow::datatypes::{DataType, Field, Fields, IntervalUnit, Schema};
@@ -52,6 +48,7 @@ use datafusion::physical_plan::expressions::{
     StringAgg, Sum,
 };
 use datafusion::physical_plan::filter::FilterExec;
+use datafusion::physical_plan::functions;
 use datafusion::physical_plan::insert::FileSinkExec;
 use datafusion::physical_plan::joins::{
     HashJoinExec, NestedLoopJoinExec, PartitionMode, StreamJoinPartitionMode,
@@ -66,7 +63,7 @@ use datafusion::physical_plan::windows::{
     BuiltInWindowExpr, PlainAggregateWindowExpr, WindowAggExec,
 };
 use datafusion::physical_plan::{
-    functions, udaf, AggregateExpr, ExecutionPlan, Partitioning, PhysicalExpr, Statistics,
+    udaf, AggregateExpr, ExecutionPlan, Partitioning, PhysicalExpr, Statistics,
 };
 use datafusion::prelude::SessionContext;
 use datafusion::scalar::ScalarValue;
@@ -82,6 +79,9 @@ use datafusion_expr::{
 };
 use datafusion_proto::physical_plan::{AsExecutionPlan, DefaultPhysicalExtensionCodec};
 use datafusion_proto::protobuf;
+use std::ops::Deref;
+use std::sync::Arc;
+use std::vec;
 
 /// Perform a serde roundtrip and assert that the string representation of the before and after plans
 /// are identical. Note that this often isn't sufficient to guarantee that no information is
@@ -600,10 +600,10 @@ fn roundtrip_builtin_scalar_function() -> Result<()> {
     let execution_props = ExecutionProps::new();
 
     let fun_expr =
-        functions::create_physical_fun(&BuiltinScalarFunction::Acos, &execution_props)?;
+        functions::create_physical_fun(&BuiltinScalarFunction::Sin, &execution_props)?;
 
     let expr = ScalarFunctionExpr::new(
-        "acos",
+        "sin",
         fun_expr,
         vec![col("a", &schema)?],
         DataType::Float64,