// Copyright 2021 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 xsql import ( "fmt" "github.com/lf-edge/ekuiper/pkg/ast" ) // Validate validate select statement without context. // This is the pre-validation. In planner, there will be a more comprehensive validation after binding func Validate(stmt *ast.SelectStatement) error { if HasAggFuncs(stmt.Condition) { return fmt.Errorf("Not allowed to call aggregate functions in WHERE clause.") } for _, d := range stmt.Dimensions { if HasAggFuncs(d.Expr) { return fmt.Errorf("Not allowed to call aggregate functions in GROUP BY clause.") } } return nil }