// Copyright 2023 EMQ Technologies Co., Ltd. // // 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. package function import ( "github.com/lf-edge/ekuiper/pkg/api" "github.com/lf-edge/ekuiper/pkg/ast" ) func registerWindowFunc() { builtins["row_number"] = builtinFunc{ fType: ast.FuncTypeWindow, // we implement window functions in windowFuncOperator instead of exec. exec: func(ctx api.FunctionContext, args []interface{}) (interface{}, bool) { return nil, true }, val: ValidateNoArg, } }