Simple Functions WIP

Cargo.toml

@@ -23,6 +23,8 @@ members = [
     "datafusion/catalog",
     "datafusion/catalog-listing",
     "datafusion/core",
+    "datafusion/excalibur/lib",
+    "datafusion/excalibur/macros",
     "datafusion/expr",
     "datafusion/expr-common",
     "datafusion/execution",
@@ -104,6 +106,8 @@ datafusion-common = { path = "datafusion/common", version = "45.0.0", default-fe
 datafusion-common-runtime = { path = "datafusion/common-runtime", version = "45.0.0" }
 datafusion-datasource = { path = "datafusion/datasource", version = "45.0.0", default-features = false }
 datafusion-doc = { path = "datafusion/doc", version = "45.0.0" }
+datafusion-excalibur = { path = "datafusion/excalibur/lib", version = "45.0.0" }
+datafusion-excalibur-macros = { path = "datafusion/excalibur/macros", version = "45.0.0" }
 datafusion-execution = { path = "datafusion/execution", version = "45.0.0" }
 datafusion-expr = { path = "datafusion/expr", version = "45.0.0" }
 datafusion-expr-common = { path = "datafusion/expr-common", version = "45.0.0" }

datafusion/excalibur/lib/Cargo.toml

@@ -0,0 +1,36 @@
+# 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.
+
+[package]
+name = "datafusion-excalibur"
+version = { workspace = true }
+edition = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+authors = { workspace = true }
+rust-version = { workspace = true }
+
+[lints]
+workspace = true
+
+[dependencies]
+arrow = { workspace = true }
+datafusion-common = { workspace = true }
+datafusion-excalibur-macros = { workspace = true }
+datafusion-expr = { workspace = true }
+datafusion-expr-common = { workspace = true }

datafusion/excalibur/lib/src/arg_type.rs

@@ -0,0 +1,47 @@
+// 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.
+
+use crate::reader::ExArrayReaderConsumer;
+use datafusion_common::types::NativeType;
+use datafusion_common::Result;
+use datafusion_expr::ColumnarValue;
+
+pub trait ExInstantiable {
+    type StackType<'a>;
+}
+
+pub trait ExArgType: ExInstantiable {
+    fn logical_type() -> NativeType;
+
+    fn decode(
+        arg: ColumnarValue,
+        consumer: impl for<'a> ExArrayReaderConsumer<ValueType<'a> = Self::StackType<'a>>,
+    ) -> Result<()>;
+}
+
+pub type FindExArgType<T> = <T as ExFindImplementation>::Type;
+
+pub trait ExFindImplementation {
+    type Type: ExArgType;
+}
+
+impl<T> ExFindImplementation for T
+where
+    T: ExArgType,
+{
+    type Type = T;
+}

datafusion/excalibur/lib/src/arg_type_list.rs

@@ -0,0 +1,43 @@
+// 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.
+
+use crate::arg_type::ExArgType;
+use datafusion_expr::TypeSignatureClass;
+use std::sync::Arc;
+
+pub trait ExArgTypeList {
+    fn type_signature() -> Vec<TypeSignatureClass>;
+}
+
+impl ExArgTypeList for () {
+    fn type_signature() -> Vec<TypeSignatureClass> {
+        vec![]
+    }
+}
+
+impl<Head, Tail> ExArgTypeList for (Head, Tail)
+where
+    Head: ExArgType,
+    Tail: ExArgTypeList,
+{
+    fn type_signature() -> Vec<TypeSignatureClass> {
+        let mut signature =
+            vec![TypeSignatureClass::Native(Arc::new(Head::logical_type()))];
+        signature.extend(Tail::type_signature());
+        signature
+    }
+}

datafusion/excalibur/lib/src/boolean.rs

@@ -0,0 +1,72 @@
+// 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.
+
+use crate::builder::{ExArrayBuilder, ExFullResultType};
+use crate::primitive_type;
+use crate::reader::ExArrayReader;
+use arrow::array::{Array, ArrayRef, BooleanArray, BooleanBuilder};
+use arrow::datatypes::DataType;
+use datafusion_common::cast::as_boolean_array;
+use datafusion_common::Result;
+use std::sync::Arc;
+
+primitive_type!(bool, Boolean, BooleanArray, as_boolean_array);
+
+impl<'a> ExArrayReader<'a> for &'a BooleanArray {
+    type ValueType = bool;
+
+    fn is_valid(&self, position: usize) -> bool {
+        Array::is_valid(self, position)
+    }
+
+    fn get(&self, position: usize) -> Self::ValueType {
+        self.value(position)
+    }
+}
+
+impl ExFullResultType for ((), bool) {
+    type BuilderType = BooleanBuilder;
+
+    fn data_type() -> DataType {
+        DataType::Boolean
+    }
+
+    fn builder_with_capacity(number_rows: usize) -> Self::BuilderType {
+        Self::BuilderType::with_capacity(number_rows)
+    }
+}
+
+impl ExArrayBuilder for BooleanBuilder {
+    type OutArg = ();
+    type Return = bool;
+
+    fn get_out_arg(&mut self, _position: usize) -> Self::OutArg {}
+
+    fn append(&mut self, fn_ret: Self::Return) -> Result<()> {
+        self.append_value(fn_ret);
+        Ok(())
+    }
+
+    fn append_null(&mut self) -> Result<()> {
+        self.append_null();
+        Ok(())
+    }
+
+    fn build(mut self) -> Result<ArrayRef> {
+        Ok(Arc::new(self.finish()))
+    }
+}