/
decorator.go
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/
decorator.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// 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 plan
import (
"github.com/dolthub/go-mysql-server/sql"
)
type DecorationType byte
// DecoratedNode represents a plan node that has been decorated to illustrate some aspect of the query plan
type DecoratedNode struct {
UnaryNode
decoration string
}
var _ sql.Node = (*DecoratedNode)(nil)
func (n *DecoratedNode) RowIter(context *sql.Context, row sql.Row) (sql.RowIter, error) {
return n.Child.RowIter(context, row)
}
func (n *DecoratedNode) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(n, len(children), 1)
}
return NewDecoratedNode(n.decoration, children[0]), nil
}
// NewDecoratedNode creates a new instance of DecoratedNode wrapping the node given, with the Deocration string given.
func NewDecoratedNode(decoration string, node sql.Node) *DecoratedNode {
return &DecoratedNode{
UnaryNode: UnaryNode{node},
decoration: decoration,
}
}
func (n *DecoratedNode) String() string {
pr := sql.NewTreePrinter()
_ = pr.WriteNode("%s", n.decoration)
_ = pr.WriteChildren(n.UnaryNode.Child.String())
return pr.String()
}
func (n *DecoratedNode) DebugString() string {
pr := sql.NewTreePrinter()
_ = pr.WriteNode("%s", n.decoration)
_ = pr.WriteChildren(sql.DebugString(n.UnaryNode.Child))
return pr.String()
}