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concatenate.go
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concatenate.go
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/*
Copyright 2020 The Vitess Authors.
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 planbuilder
import (
"vitess.io/vitess/go/vt/sqlparser"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vtgate/engine"
)
type concatenate struct {
v3Plan
lhs, rhs logicalPlan
order int
}
var _ logicalPlan = (*concatenate)(nil)
func (c *concatenate) Order() int {
return c.order
}
func (c *concatenate) ResultColumns() []*resultColumn {
return c.lhs.ResultColumns()
}
func (c *concatenate) Reorder(order int) {
c.lhs.Reorder(order)
c.rhs.Reorder(c.lhs.Order())
c.order = c.rhs.Order() + 1
}
func (c *concatenate) Wireup(plan logicalPlan, jt *jointab) error {
// TODO systay should we do something different here?
err := c.lhs.Wireup(plan, jt)
if err != nil {
return err
}
return c.rhs.Wireup(plan, jt)
}
func (c *concatenate) SupplyVar(from, to int, col *sqlparser.ColName, varname string) {
panic("implement me")
}
func (c *concatenate) SupplyCol(col *sqlparser.ColName) (rc *resultColumn, colNumber int) {
panic("implement me")
}
func (c *concatenate) SupplyWeightString(colNumber int, alsoAddToGroupBy bool) (weightcolNumber int, err error) {
panic("implement me")
}
func (c *concatenate) Primitive() engine.Primitive {
lhs := c.lhs.Primitive()
rhs := c.rhs.Primitive()
return engine.NewConcatenate([]engine.Primitive{lhs, rhs}, nil)
}
// Rewrite implements the logicalPlan interface
func (c *concatenate) Rewrite(inputs ...logicalPlan) error {
if len(inputs) != 2 {
return vterrors.VT13001("concatenate: wrong number of inputs")
}
c.lhs = inputs[0]
c.rhs = inputs[1]
return nil
}
// Inputs implements the logicalPlan interface
func (c *concatenate) Inputs() []logicalPlan {
return []logicalPlan{c.lhs, c.rhs}
}