arrow2 0.18.0

Unofficial implementation of Apache Arrow spec in safe Rust
Documentation 
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

use arrow2::{
    array::{
        growable::{Growable, GrowableList},
        Array, ListArray, MutableListArray, MutablePrimitiveArray, TryExtend,
    },
    datatypes::DataType,
};

fn create_list_array(data: Vec<Option<Vec<Option<i32>>>>) -> ListArray<i32> {
    let mut array = MutableListArray::<i32, MutablePrimitiveArray<i32>>::new();
    array.try_extend(data).unwrap();
    array.into()
}

#[test]
fn extension() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        Some(vec![Some(4), Some(5)]),
        Some(vec![Some(6i32), Some(7), Some(8)]),
    ];

    let array = create_list_array(data);

    let data_type =
        DataType::Extension("ext".to_owned(), Box::new(array.data_type().clone()), None);
    let array_ext = ListArray::new(
        data_type,
        array.offsets().clone(),
        array.values().clone(),
        array.validity().cloned(),
    );

    let mut a = GrowableList::new(vec![&array_ext], false, 0);
    a.extend(0, 0, 1);
    assert_eq!(a.len(), 1);

    let result: ListArray<i32> = a.into();
    assert_eq!(array_ext.data_type(), result.data_type());
    dbg!(result);
}

#[test]
fn basic() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        Some(vec![Some(4), Some(5)]),
        Some(vec![Some(6i32), Some(7), Some(8)]),
    ];

    let array = create_list_array(data);

    let mut a = GrowableList::new(vec![&array], false, 0);
    a.extend(0, 0, 1);
    assert_eq!(a.len(), 1);

    let result: ListArray<i32> = a.into();

    let expected = vec![Some(vec![Some(1i32), Some(2), Some(3)])];
    let expected = create_list_array(expected);

    assert_eq!(result, expected)
}

#[test]
fn null_offset() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(6i32), Some(7), Some(8)]),
    ];
    let array = create_list_array(data);
    let array = array.sliced(1, 2);

    let mut a = GrowableList::new(vec![&array], false, 0);
    a.extend(0, 1, 1);
    assert_eq!(a.len(), 1);

    let result: ListArray<i32> = a.into();

    let expected = vec![Some(vec![Some(6i32), Some(7), Some(8)])];
    let expected = create_list_array(expected);

    assert_eq!(result, expected)
}

#[test]
fn null_offsets() {
    let data = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(6i32), None, Some(8)]),
    ];
    let array = create_list_array(data);
    let array = array.sliced(1, 2);

    let mut a = GrowableList::new(vec![&array], false, 0);
    a.extend(0, 1, 1);
    assert_eq!(a.len(), 1);

    let result: ListArray<i32> = a.into();

    let expected = vec![Some(vec![Some(6i32), None, Some(8)])];
    let expected = create_list_array(expected);

    assert_eq!(result, expected)
}

#[test]
fn test_from_two_lists() {
    let data_1 = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(6i32), None, Some(8)]),
    ];
    let array_1 = create_list_array(data_1);

    let data_2 = vec![
        Some(vec![Some(8i32), Some(7), Some(6)]),
        Some(vec![Some(5i32), None, Some(4)]),
        Some(vec![Some(2i32), Some(1), Some(0)]),
    ];
    let array_2 = create_list_array(data_2);

    let mut a = GrowableList::new(vec![&array_1, &array_2], false, 6);
    a.extend(0, 0, 2);
    a.extend(1, 1, 1);
    assert_eq!(a.len(), 3);

    let result: ListArray<i32> = a.into();

    let expected = vec![
        Some(vec![Some(1i32), Some(2), Some(3)]),
        None,
        Some(vec![Some(5i32), None, Some(4)]),
    ];
    let expected = create_list_array(expected);

    assert_eq!(result, expected);
}