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
|
// 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.
//go:build go1.18
package compute
import (
"context"
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/compute/internal/kernels"
)
var (
uniqueDoc = FunctionDoc{
Summary: "Compute unique elements",
Description: "Return an array with distinct values. Nulls in the input are ignored",
ArgNames: []string{"array"},
}
)
func Unique(ctx context.Context, values Datum) (Datum, error) {
return CallFunction(ctx, "unique", nil, values)
}
func UniqueArray(ctx context.Context, values arrow.Array) (arrow.Array, error) {
out, err := Unique(ctx, &ArrayDatum{Value: values.Data()})
if err != nil {
return nil, err
}
defer out.Release()
return out.(*ArrayDatum).MakeArray(), nil
}
func RegisterVectorHash(reg FunctionRegistry) {
unique, _, _ := kernels.GetVectorHashKernels()
uniqFn := NewVectorFunction("unique", Unary(), uniqueDoc)
for _, vd := range unique {
if err := uniqFn.AddKernel(vd); err != nil {
panic(err)
}
}
reg.AddFunction(uniqFn, false)
}
|
