forked from cockroachdb/cockroach
/
delayed.go
69 lines (61 loc) · 2.25 KB
/
delayed.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
// Copyright 2016 The Cockroach 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.
//
// Author: Raphael 'kena' Poss (knz@cockroachlabs.com)
package sql
import "github.com/cockroachdb/cockroach/pkg/sql/parser"
// delayedNode wraps a planNode in cases where the planNode
// constructor must be dealyed during query execution (as opposed to
// SQL prepare) for resource tracking purposes.
type delayedNode struct {
p *planner
name string
columns ResultColumns
constructor nodeConstructor
plan planNode
}
type nodeConstructor func(p *planner) (planNode, error)
func (d *delayedNode) SetLimitHint(_ int64, _ bool) {}
func (d *delayedNode) expandPlan() error {
v, err := d.constructor(d.p)
if err != nil {
return err
}
if err := v.expandPlan(); err != nil {
v.Close()
return err
}
d.plan = v
return nil
}
func (d *delayedNode) Close() {
if d.plan != nil {
d.plan.Close()
d.plan = nil
}
}
func (d *delayedNode) ExplainPlan(verbose bool) (name, description string, children []planNode) {
if d.plan != nil {
children = []planNode{d.plan}
}
return "virtual table", d.name, children
}
func (d *delayedNode) ExplainTypes(rt func(string, string)) {}
func (d *delayedNode) Columns() ResultColumns { return d.columns }
func (d *delayedNode) Ordering() orderingInfo { return orderingInfo{} }
func (d *delayedNode) MarkDebug(_ explainMode) {}
func (d *delayedNode) Start() error { return d.plan.Start() }
func (d *delayedNode) Next() (bool, error) { return d.plan.Next() }
func (d *delayedNode) Values() parser.DTuple { return d.plan.Values() }
func (d *delayedNode) DebugValues() debugValues { return d.plan.DebugValues() }