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
88
89
90
91
92
93
94
95
96
97
|
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 scalar
import "github.com/apache/arrow-go/v18/arrow"
// Equals returns true if two scalars are equal, which means they have the same
// datatype, validity and value.
func Equals(left, right Scalar) bool {
if left == right {
return true
}
if !arrow.TypeEqual(left.DataType(), right.DataType()) {
return false
}
if left.IsValid() != right.IsValid() {
return false
}
if !left.IsValid() {
return true
}
return left.equals(right)
}
type equalOption struct {
atol float64 // absolute tolerance
nansEq bool // whether NaNs are considered equal
}
// EqualOption is a functional option type used to configure how Records and Arrays are compared.
type EqualOption func(*equalOption)
// WithNaNsEqual configures the comparison functions so that NaNs are considered equal.
func WithNaNsEqual(val bool) EqualOption {
return func(eo *equalOption) {
eo.nansEq = val
}
}
// WithAbsTolerance configures the comparison functions so that 2 floating point values
// v1 and v2 are considered equal if |v1-v2| <= atol.
func WithAbsTolerance(atol float64) EqualOption {
return func(eo *equalOption) {
eo.atol = atol
}
}
const defaultAbsoluteTolerance = 1e-5
type approxEqualScalar interface {
approxEquals(Scalar, equalOption) bool
}
func ApproxEquals(left, right Scalar, opts ...EqualOption) bool {
eq := equalOption{
atol: defaultAbsoluteTolerance,
nansEq: false,
}
for _, opt := range opts {
opt(&eq)
}
switch {
case left == right:
return true
case !arrow.TypeEqual(left.DataType(), right.DataType()):
return false
case left.IsValid() != right.IsValid():
return false
case !left.IsValid():
return true
}
if approx, ok := left.(approxEqualScalar); ok {
return approx.approxEquals(right, eq)
}
return left.equals(right)
}
|
