feat: Add vec_mul function.

src/common/function/src/scalars/vector.rs

@@ -17,6 +17,7 @@ mod distance;
 pub(crate) mod impl_conv;
 mod scalar_add;
 mod scalar_mul;
+mod vector_mul;
 
 use std::sync::Arc;
 
@@ -38,5 +39,8 @@ impl VectorFunction {
         // scalar calculation
         registry.register(Arc::new(scalar_add::ScalarAddFunction));
         registry.register(Arc::new(scalar_mul::ScalarMulFunction));
+
+        // vector calculation
+        registry.register(Arc::new(vector_mul::VectorMulFunction));
     }
 }

src/common/function/src/scalars/vector/vector_mul.rs

@@ -0,0 +1,184 @@
+// Copyright 2023 Greptime Team
+//
+// Licensed 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 std::borrow::Cow;
+use std::fmt::Display;
+
+use common_query::error::{InvalidFuncArgsSnafu, Result};
+use common_query::prelude::Signature;
+use datatypes::prelude::ConcreteDataType;
+use datatypes::scalars::ScalarVectorBuilder;
+use datatypes::vectors::{BinaryVectorBuilder, MutableVector, VectorRef};
+use nalgebra::DVectorView;
+use snafu::ensure;
+
+use crate::function::{Function, FunctionContext};
+use crate::helper;
+use crate::scalars::vector::impl_conv::{as_veclit, as_veclit_if_const, veclit_to_binlit};
+
+const NAME: &str = "vec_mul";
+
+/// Multiplies corresponding elements of two vectors.
+///
+/// # Example
+///
+/// ```sql
+/// SELECT vec_to_string(vec_mul("[1, 2, 3]", "[1, 2, 3]")) as result;
+///
+/// +---------+
+/// | result  |
+/// +---------+
+/// | [1,4,9] |
+/// +---------+
+///
+/// ```
+#[derive(Debug, Clone, Default)]
+pub struct VectorMulFunction;
+
+impl Function for VectorMulFunction {
+    fn name(&self) -> &str {
+        NAME
+    }
+
+    fn return_type(&self, _input_types: &[ConcreteDataType]) -> Result<ConcreteDataType> {
+        Ok(ConcreteDataType::binary_datatype())
+    }
+
+    fn signature(&self) -> Signature {
+        helper::one_of_sigs2(
+            vec![
+                ConcreteDataType::string_datatype(),
+                ConcreteDataType::binary_datatype(),
+            ],
+            vec![
+                ConcreteDataType::string_datatype(),
+                ConcreteDataType::binary_datatype(),
+            ],
+        )
+    }
+
+    fn eval(&self, _func_ctx: FunctionContext, columns: &[VectorRef]) -> Result<VectorRef> {
+        ensure!(
+            columns.len() == 2,
+            InvalidFuncArgsSnafu {
+                err_msg: format!(
+                    "The length of the args is not correct, expect exactly two, have: {}",
+                    columns.len()
+                ),
+            }
+        );
+
+        let arg0 = &columns[0];
+        let arg1 = &columns[1];
+
+        let len = arg0.len();
+        let mut result = BinaryVectorBuilder::with_capacity(len);
+        if len == 0 {
+            return Ok(result.to_vector());
+        }
+
+        let arg0_const = as_veclit_if_const(arg0)?;
+        let arg1_const = as_veclit_if_const(arg1)?;
+
+        for i in 0..len {
+            let arg0 = match arg0_const.as_ref() {
+                Some(arg0) => Some(Cow::Borrowed(arg0.as_ref())),
+                None => as_veclit(arg0.get_ref(i))?,
+            };
+
+            let arg1 = match arg1_const.as_ref() {
+                Some(arg1) => Some(Cow::Borrowed(arg1.as_ref())),
+                None => as_veclit(arg1.get_ref(i))?,
+            };
+
+            if let (Some(arg0), Some(arg1)) = (arg0, arg1) {
+                ensure!(
+                    arg0.len() == arg1.len(),
+                    InvalidFuncArgsSnafu {
+                        err_msg: format!(
+                            "The length of the vectors must match for multiplying, have: {} vs {}",
+                            arg0.len(),
+                            arg1.len()
+                        ),
+                    }
+                );
+                let vec0 = DVectorView::from_slice(&arg0, arg0.len());
+                let vec1 = DVectorView::from_slice(&arg1, arg1.len());
+                let vec_res = vec1.component_mul(&vec0);
+
+                let veclit = vec_res.as_slice();
+                let binlit = veclit_to_binlit(veclit);
+                result.push(Some(&binlit));
+            } else {
+                result.push_null();
+            }
+        }
+
+        Ok(result.to_vector())
+    }
+}
+
+impl Display for VectorMulFunction {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", NAME.to_ascii_uppercase())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use datatypes::vectors::StringVector;
+
+    use super::*;
+
+    #[test]
+    fn test_vector_mul() {
+        let func = VectorMulFunction;
+
+        let input0 = Arc::new(StringVector::from(vec![
+            Some("[1.0,2.0,3.0]".to_string()),
+            Some("[8.0,10.0,12.0]".to_string()),
+            Some("[7.0,8.0,9.0]".to_string()),
+            None,
+        ]));
+
+        let input1 = Arc::new(StringVector::from(vec![
+            Some("[1.0,2.0,3.0]".to_string()),
+            Some("[8.0,10.0,12.0]".to_string()),
+            Some("[7.0,8.0,9.0]".to_string()),
+            None,
+        ]));
+
+        let result = func
+            .eval(FunctionContext::default(), &[input0, input1])
+            .unwrap();
+
+        let result = result.as_ref();
+        assert_eq!(result.len(), 4);
+        assert_eq!(
+            result.get_ref(0).as_binary().unwrap(),
+            Some(veclit_to_binlit(&[1.0, 4.0, 9.0]).as_slice())
+        );
+        assert_eq!(
+            result.get_ref(1).as_binary().unwrap(),
+            Some(veclit_to_binlit(&[64.0, 100.0, 144.0]).as_slice())
+        );
+        assert_eq!(
+            result.get_ref(2).as_binary().unwrap(),
+            Some(veclit_to_binlit(&[49.0, 64.0, 81.0]).as_slice())
+        );
+        assert!(result.get_ref(3).is_null());
+    }
+}

tests/cases/standalone/common/function/vector/vector.result

@@ -22,3 +22,27 @@ SELECT vec_to_string(parse_vec('[]'));
 | []                                   |
 +--------------------------------------+
 
+SELECT vec_to_string(vec_mul('[1.0, 2.0]', '[3.0, 4.0]'));
+
++---------------------------------------------------------------+
+| vec_to_string(vec_mul(Utf8("[1.0, 2.0]"),Utf8("[3.0, 4.0]"))) |
++---------------------------------------------------------------+
+| [3,8]                                                         |
++---------------------------------------------------------------+
+
+SELECT vec_to_string(vec_mul(parse_vec('[1.0, 2.0]'), '[3.0, 4.0]'));
+
++--------------------------------------------------------------------------+
+| vec_to_string(vec_mul(parse_vec(Utf8("[1.0, 2.0]")),Utf8("[3.0, 4.0]"))) |
++--------------------------------------------------------------------------+
+| [3,8]                                                                    |
++--------------------------------------------------------------------------+
+
+SELECT vec_to_string(vec_mul('[1.0, 2.0]', parse_vec('[3.0, 4.0]')));
+
++--------------------------------------------------------------------------+
+| vec_to_string(vec_mul(Utf8("[1.0, 2.0]"),parse_vec(Utf8("[3.0, 4.0]")))) |
++--------------------------------------------------------------------------+
+| [3,8]                                                                    |
++--------------------------------------------------------------------------+
+

tests/cases/standalone/common/function/vector/vector.sql

@@ -3,3 +3,9 @@ SELECT vec_to_string(parse_vec('[1.0, 2.0]'));
 SELECT vec_to_string(parse_vec('[1.0, 2.0, 3.0]'));
 
 SELECT vec_to_string(parse_vec('[]'));
+
+SELECT vec_to_string(vec_mul('[1.0, 2.0]', '[3.0, 4.0]'));
+
+SELECT vec_to_string(vec_mul(parse_vec('[1.0, 2.0]'), '[3.0, 4.0]'));
+
+SELECT vec_to_string(vec_mul('[1.0, 2.0]', parse_vec('[3.0, 4.0]')));