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

use parquet2::schema::types::PrimitiveType;
use parquet2::{encoding::Encoding, page::DataPage};

use super::super::{nested, utils, WriteOptions};
use super::basic::{build_statistics, encode_plain};
use crate::io::parquet::read::schema::is_nullable;
use crate::io::parquet::write::Nested;
use crate::{
    array::{Array, BinaryArray},
    error::Result,
    offset::Offset,
};

pub fn array_to_page<O>(
    array: &BinaryArray<O>,
    options: WriteOptions,
    type_: PrimitiveType,
    nested: &[Nested],
) -> Result<DataPage>
where
    O: Offset,
{
    let is_optional = is_nullable(&type_.field_info);

    let mut buffer = vec![];
    let (repetition_levels_byte_length, definition_levels_byte_length) =
        nested::write_rep_and_def(options.version, nested, &mut buffer)?;

    encode_plain(array, is_optional, &mut buffer);

    let statistics = if options.write_statistics {
        Some(build_statistics(array, type_.clone()))
    } else {
        None
    };

    utils::build_plain_page(
        buffer,
        nested::num_values(nested),
        nested[0].len(),
        array.null_count(),
        repetition_levels_byte_length,
        definition_levels_byte_length,
        statistics,
        type_,
        options,
        Encoding::Plain,
    )
}