mirror of
https://gitee.com/milvus-io/milvus.git
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87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package autoindex
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import (
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"fmt"
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"strings"
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//"strconv"
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"github.com/milvus-io/milvus-proto/go-api/commonpb"
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"github.com/sandertv/go-formula/v2"
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)
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const (
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TopKKey = "topk"
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)
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var _ calculateFunc = (*function)(nil)
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type calculateFunc interface {
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calculate(params []*commonpb.KeyValuePair) (map[string]interface{}, error)
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GetInputKey() string
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GetOutputKey() string
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}
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type function struct {
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f *formula.Formula
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input string
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inputKey string
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outputKey string
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}
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func newFunction(stmt string) (*function, error) {
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input, output, expr, err := parseAssignment(stmt)
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if err != nil {
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return nil, fmt.Errorf("parse function failed, wrong format:%w", err)
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}
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f, err := formula.New(expr)
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if err != nil {
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return nil, fmt.Errorf("parse function failed, wrong format:%w", err)
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}
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ret := &function{}
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ret.f = f
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ret.input = input
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ret.inputKey = strings.TrimPrefix(input, VariablePrefix)
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ret.outputKey = strings.TrimPrefix(output, VariablePrefix)
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return ret, nil
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}
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func (f *function) calculate(params []*commonpb.KeyValuePair) (map[string]interface{}, error) {
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inputValue, err := getInt64FromParams(params, f.inputKey)
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if err != nil {
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return nil, err
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}
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inputVar := formula.Var(f.input, inputValue)
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outputValue, err := f.f.Eval(inputVar)
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if err != nil {
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return nil, fmt.Errorf("calculate failed:%w", err)
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}
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ret := make(map[string]interface{})
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ret[f.outputKey] = int64(outputValue)
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return ret, nil
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}
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func (f *function) GetInputKey() string {
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return f.inputKey
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}
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func (f *function) GetOutputKey() string {
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return f.outputKey
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}
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