vortex-array 0.81.0

Vortex in memory columnar data format
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

// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright the Vortex contributors

//! Canonical sparse union arrays.
//!
//! A [`UnionArray`] stores one `u8` type ID per row followed by one row-aligned child for each
//! variant. The type ID selects which child's value is active for a row; values in all other
//! children at that row are placeholders. Outer union nulls are stored as nulls in the type IDs
//! child, independently of nulls in the selected variant child.
//!
//! Type ID values are not validated during construction. Accessing a non-null row whose type ID
//! is not declared by the union variants will panic.

use crate::dtype::DType;
use crate::dtype::Nullability;
use crate::dtype::PType;

mod array;
pub use array::UnionArrayExt;
pub use array::UnionDataParts;
pub use vtable::UnionArray;

mod vtable;
pub use vtable::Union;

pub(crate) fn union_type_ids_dtype(nullability: Nullability) -> DType {
    DType::Primitive(PType::U8, nullability)
}

#[cfg(test)]
mod tests;