This repository has been archived by the owner on Feb 16, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 108
/
plan.go
87 lines (80 loc) · 2.38 KB
/
plan.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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
// Copyright 2019 eBay Inc.
// Primary authors: Simon Fell, Diego Ongaro,
// Raymond Kroeker, and Sathish Kandasamy.
//
// 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
// https://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 plandef defines the output of the query planner. It defines all of
// Akutan's physical execution plan operators.
package plandef
import (
"fmt"
"strings"
"github.com/ebay/akutan/util/cmp"
)
// A Plan is an tree of physical operators that Akutan can execute to answer a
// query.
type Plan struct {
// Which operation to execute, including its scalar arguments.
Operator Operator
// The results that the operator takes as inputs, if any. For example, a
// HashJoin takes two inputs, but lookups take none.
Inputs []*Plan
// The variables whose values are output by the plan node.
Variables VarSet
}
// String returns a multi-line indented human-readable string describing the
// execution plan.
func (plan *Plan) String() string {
var b strings.Builder
var print func(plan *Plan, indent string)
print = func(plan *Plan, indent string) {
fmt.Fprintf(&b, "%v%v\n", indent, plan.Operator)
for _, input := range plan.Inputs {
print(input, indent+"\t")
}
}
print(plan, "")
return b.String()
}
// Operator is a physical, executable operator.
type Operator interface {
String() string
cmp.Key
anOperator()
}
// ImplementOperator is a list of types that implement Operator.
// This serves as documentation and as a compile-time check.
var ImplementOperator = []Operator{
// Defined in joins.go
new(HashJoin),
new(LoopJoin),
// Defined in lookups.go
new(InferPO),
new(InferSP),
new(InferSPO),
new(LookupPO),
new(LookupPOCmp),
new(LookupS),
new(LookupSP),
new(LookupSPO),
// Defined in select.go
new(SelectLit),
new(SelectVar),
// Defined in enumerate.go
new(Enumerate),
// Defined in query.go
new(ExternalIDs),
new(Projection),
new(OrderByOp),
new(LimitAndOffsetOp),
new(DistinctOp),
}