github.com/vescale/zgraph@v0.0.0-20230410094002-959c02d50f95/planner/orderby.go (about) 1 // Copyright 2022 zGraph Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package planner 16 17 import ( 18 "fmt" 19 20 "github.com/vescale/zgraph/expression" 21 "github.com/vescale/zgraph/parser/model" 22 ) 23 24 // ByItem wraps a "by" item. 25 type ByItem struct { 26 Expr expression.Expression 27 AsName model.CIStr 28 Desc bool 29 NullOrder bool 30 } 31 32 // String implements fmt.Stringer interface. 33 func (by *ByItem) String() string { 34 if by.Desc { 35 return fmt.Sprintf("%s true", by.Expr) 36 } 37 return by.Expr.String() 38 } 39 40 type LogicalSort struct { 41 baseLogicalPlan 42 43 ByItems []*ByItem 44 } 45 46 type PhysicalSort struct { 47 basePhysicalPlan 48 49 ByItems []*ByItem 50 }