vitess.io/vitess@v0.16.2/go/vt/vtgate/planbuilder/concatenate.go (about) 1 /* 2 Copyright 2020 The Vitess Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package planbuilder 18 19 import ( 20 "vitess.io/vitess/go/vt/sqlparser" 21 "vitess.io/vitess/go/vt/vterrors" 22 "vitess.io/vitess/go/vt/vtgate/engine" 23 ) 24 25 type concatenate struct { 26 v3Plan 27 lhs, rhs logicalPlan 28 order int 29 } 30 31 var _ logicalPlan = (*concatenate)(nil) 32 33 func (c *concatenate) Order() int { 34 return c.order 35 } 36 37 func (c *concatenate) ResultColumns() []*resultColumn { 38 return c.lhs.ResultColumns() 39 } 40 41 func (c *concatenate) Reorder(order int) { 42 c.lhs.Reorder(order) 43 c.rhs.Reorder(c.lhs.Order()) 44 c.order = c.rhs.Order() + 1 45 } 46 47 func (c *concatenate) Wireup(plan logicalPlan, jt *jointab) error { 48 // TODO systay should we do something different here? 49 err := c.lhs.Wireup(plan, jt) 50 if err != nil { 51 return err 52 } 53 return c.rhs.Wireup(plan, jt) 54 } 55 56 func (c *concatenate) SupplyVar(from, to int, col *sqlparser.ColName, varname string) { 57 panic("implement me") 58 } 59 60 func (c *concatenate) SupplyCol(col *sqlparser.ColName) (rc *resultColumn, colNumber int) { 61 panic("implement me") 62 } 63 64 func (c *concatenate) SupplyWeightString(colNumber int, alsoAddToGroupBy bool) (weightcolNumber int, err error) { 65 panic("implement me") 66 } 67 68 func (c *concatenate) Primitive() engine.Primitive { 69 lhs := c.lhs.Primitive() 70 rhs := c.rhs.Primitive() 71 72 return engine.NewConcatenate([]engine.Primitive{lhs, rhs}, nil) 73 } 74 75 // Rewrite implements the logicalPlan interface 76 func (c *concatenate) Rewrite(inputs ...logicalPlan) error { 77 if len(inputs) != 2 { 78 return vterrors.VT13001("concatenate: wrong number of inputs") 79 } 80 c.lhs = inputs[0] 81 c.rhs = inputs[1] 82 return nil 83 } 84 85 // Inputs implements the logicalPlan interface 86 func (c *concatenate) Inputs() []logicalPlan { 87 return []logicalPlan{c.lhs, c.rhs} 88 }