vortex_array/vtable/
operations.rs

1// SPDX-License-Identifier: Apache-2.0
2// SPDX-FileCopyrightText: Copyright the Vortex contributors
3
4use vortex_scalar::Scalar;
5
6use crate::ArrayRef;
7use crate::vtable::VTable;
8
9pub trait OperationsVTable<V: VTable> {
10    /// Perform a constant-time slice of the array.
11    ///
12    /// If an encoding cannot perform this slice in constant time, it should internally
13    /// store an offset and length in order to defer slicing until the array is accessed.
14    ///
15    /// This function returns [`ArrayRef`] since some encodings can return a simpler array for
16    /// some slices, for example a [`crate::arrays::ChunkedArray`] may slice into a single chunk.
17    ///
18    /// ## Preconditions
19    ///
20    /// Bounds-checking has already been performed by the time this function is called.
21    fn slice(array: &V::Array, start: usize, stop: usize) -> ArrayRef;
22
23    /// Fetch the scalar at the given index.
24    ///
25    /// ## Preconditions
26    ///
27    /// Bounds-checking has already been performed by the time this function is called,
28    /// and the index is guaranteed to be non-null.
29    fn scalar_at(array: &V::Array, index: usize) -> Scalar;
30}
vortex_array/vtable/operations.rs

vortex_array/vtable/
operations.rs
