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

use vortex_buffer::Buffer;
use vortex_error::VortexResult;
use vortex_scalar::Scalar;

use crate::array::varbin::varbin_scalar;
use crate::array::varbinview::{VarBinViewArray, VIEW_SIZE};
use crate::compute::unary::ScalarAtFn;
use crate::compute::{slice, ArrayCompute, SliceFn};
use crate::validity::ArrayValidity;
use crate::{Array, ArrayDType, IntoArray};

impl ArrayCompute for VarBinViewArray {
    fn scalar_at(&self) -> Option<&dyn ScalarAtFn> {
        Some(self)
    }

    fn slice(&self) -> Option<&dyn SliceFn> {
        Some(self)
    }
}

impl ScalarAtFn for VarBinViewArray {
    fn scalar_at(&self, index: usize) -> VortexResult<Scalar> {
        if self.is_valid(index) {
            self.bytes_at(index)
                .map(|bytes| varbin_scalar(Buffer::from(bytes), self.dtype()))
        } else {
            Ok(Scalar::null(self.dtype().clone()))
        }
    }
}

impl SliceFn for VarBinViewArray {
    fn slice(&self, start: usize, stop: usize) -> VortexResult<Array> {
        Ok(Self::try_new(
            slice(&self.views(), start * VIEW_SIZE, stop * VIEW_SIZE)?,
            (0..self.metadata().data_lens.len())
                .map(|i| self.bytes(i))
                .collect::<Vec<_>>(),
            self.dtype().clone(),
            self.validity().slice(start, stop)?,
        )?
        .into_array())
    }
}