narrow 0.15.1

An implementation of Apache Arrow
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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178

//! Interop with [`arrow-rs`] arrays for logical arrays.

use std::sync::Arc;

use arrow_array::OffsetSizeTrait;

use crate::{
    array::{ArrayType, NullableArrayTypeOf, UnionType},
    arrow::LogicalArrayType,
    buffer::BufferType,
    logical::LogicalArray,
    nullability::Nullability,
    offset::Offset,
};

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
> crate::arrow::Array for LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>:
        ArrayType<T::ArrayType, Array<Buffer, OffsetItem, UnionLayout>: crate::arrow::Array>,
{
    type Array = <NullableArrayTypeOf<Nullable, T::ArrayType, Buffer, OffsetItem, UnionLayout> as crate::arrow::Array>::Array;

    fn as_field(name: &str) -> arrow_schema::Field {
        let field =
        <NullableArrayTypeOf<Nullable, T::ArrayType, Buffer, OffsetItem, UnionLayout> as crate::arrow::Array>::as_field(name);
        if let Some(extension_type) = <T as LogicalArrayType<T>>::extension_type() {
            field.with_extension_type(extension_type)
        } else {
            field
        }
    }

    fn data_type() -> arrow_schema::DataType {
        <NullableArrayTypeOf<Nullable, T::ArrayType, Buffer, OffsetItem, UnionLayout> as crate::arrow::Array>::data_type()
    }
}

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
> From<Arc<dyn arrow_array::Array>> for LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>: ArrayType<T::ArrayType>,
    crate::bitmap::Bitmap<Buffer>: FromIterator<bool>,
    <Nullable::Item<T::ArrayType> as ArrayType<T::ArrayType>>::Array<
        Buffer,
        OffsetItem,
        UnionLayout,
    >: From<Arc<dyn arrow_array::Array>>,
{
    fn from(value: Arc<dyn arrow_array::Array>) -> Self {
        Self(value.into())
    }
}

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
> From<LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>> for Arc<dyn arrow_array::Array>
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>: ArrayType<T::ArrayType>,
    <Nullable::Item<T::ArrayType> as ArrayType<T::ArrayType>>::Array<
        Buffer,
        OffsetItem,
        UnionLayout,
    >: Into<Arc<dyn arrow_array::Array>>,
{
    fn from(value: LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>) -> Self {
        Arc::new(value.0.into())
    }
}

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
> From<LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>>
    for arrow_array::FixedSizeListArray
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>: ArrayType<T::ArrayType>,
    arrow_array::FixedSizeListArray: From<
        <Nullable::Item<T::ArrayType> as ArrayType<T::ArrayType>>::Array<
            Buffer,
            OffsetItem,
            UnionLayout,
        >,
    >,
{
    fn from(value: LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>) -> Self {
        value.0.into()
    }
}

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
> From<LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>>
    for arrow_array::FixedSizeBinaryArray
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>: ArrayType<T::ArrayType>,
    arrow_array::FixedSizeBinaryArray: From<
        <Nullable::Item<T::ArrayType> as ArrayType<T::ArrayType>>::Array<
            Buffer,
            OffsetItem,
            UnionLayout,
        >,
    >,
{
    fn from(value: LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>) -> Self {
        value.0.into()
    }
}

impl<
    T: LogicalArrayType<T>,
    Nullable: Nullability,
    Buffer: BufferType,
    OffsetItem: Offset,
    UnionLayout: UnionType,
    O: OffsetSizeTrait,
> From<LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>>
    for arrow_array::GenericListArray<O>
where
    Option<T>: ArrayType<T>,
    Nullable::Item<T::ArrayType>: ArrayType<T::ArrayType>,
    arrow_array::GenericListArray<O>: From<
        <Nullable::Item<T::ArrayType> as ArrayType<T::ArrayType>>::Array<
            Buffer,
            OffsetItem,
            UnionLayout,
        >,
    >,
{
    fn from(value: LogicalArray<T, Nullable, Buffer, OffsetItem, UnionLayout>) -> Self {
        value.0.into()
    }
}

#[cfg(test)]
mod tests {
    #[test]
    #[cfg(feature = "derive")]
    fn optional_variable_size_list_logical() {
        use crate::array::{StructArray, VariableSizeBinary};

        #[derive(crate::ArrayType)]
        struct Foo {
            items: Option<Vec<VariableSizeBinary>>,
        }

        let input = [Foo { items: None }];
        let array = input.into_iter().collect::<StructArray<Foo>>();
        let record_batch = arrow_array::RecordBatch::from(array);
        assert_eq!(record_batch.num_rows(), 1);
    }
}