enhance: removed unused VectorFunction (#44178)

Signed-off-by: Buqian Zheng <zhengbuqian@gmail.com>

internal/core/src/exec/expression/Element.h

@@ -22,7 +22,6 @@
 
 #include "common/Types.h"
 #include "exec/expression/EvalCtx.h"
-#include "exec/expression/VectorFunction.h"
 #include "exec/expression/Utils.h"
 #include "exec/QueryContext.h"
 #include "expr/ITypeExpr.h"

internal/core/src/exec/expression/Expr.h

@@ -25,7 +25,6 @@
 #include "common/Json.h"
 #include "common/Types.h"
 #include "exec/expression/EvalCtx.h"
-#include "exec/expression/VectorFunction.h"
 #include "exec/expression/Utils.h"
 #include "exec/QueryContext.h"
 #include "expr/ITypeExpr.h"
@@ -62,21 +61,9 @@ class Expr {
     Expr(DataType type,
          const std::vector<std::shared_ptr<Expr>>&& inputs,
          const std::string& name)
-        : type_(type),
-          inputs_(std::move(inputs)),
-          name_(name),
-          vector_func_(nullptr) {
+        : type_(type), inputs_(std::move(inputs)), name_(name) {
     }
 
-    Expr(DataType type,
-         const std::vector<std::shared_ptr<Expr>>&& inputs,
-         std::shared_ptr<VectorFunction> vec_func,
-         const std::string& name)
-        : type_(type),
-          inputs_(std::move(inputs)),
-          name_(name),
-          vector_func_(vec_func) {
-    }
     virtual ~Expr() = default;
 
     const DataType&
@@ -133,8 +120,6 @@ class Expr {
     DataType type_;
     std::vector<std::shared_ptr<Expr>> inputs_;
     std::string name_;
-    // NOTE: unused
-    std::shared_ptr<VectorFunction> vector_func_;
 
     // whether we have offset input and do expr filtering on these data
     // default is false which means we will do expr filtering on the total segment data

internal/core/src/exec/expression/VectorFunction.h

@@ -1,47 +0,0 @@
-// Licensed to the LF AI & Data foundation 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.
-
-#pragma once
-
-#include <functional>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "common/Vector.h"
-#include "exec/QueryContext.h"
-
-namespace milvus {
-namespace exec {
-
-class VectorFunction {
- public:
-    virtual ~VectorFunction() = default;
-
-    virtual void
-    Apply(std::vector<VectorPtr>& args,
-          DataType output_type,
-          EvalCtx& context,
-          VectorPtr& result) const = 0;
-};
-
-std::shared_ptr<VectorFunction>
-GetVectorFunction(const std::string& name,
-                  const std::vector<DataType>& input_types,
-                  const QueryConfig& config);
-
-}  // namespace exec
-}  // namespace milvus