vortex_array/arrays/primitive/vtable/

mod.rs

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

use kernel::PARENT_KERNELS;
use vortex_error::VortexExpect;
use vortex_error::VortexResult;
use vortex_error::vortex_bail;
use vortex_error::vortex_ensure;
use vortex_error::vortex_panic;

use crate::ArrayRef;
use crate::EmptyMetadata;
use crate::ExecutionCtx;
use crate::ExecutionStep;
use crate::IntoArray;
use crate::arrays::PrimitiveArray;
use crate::buffer::BufferHandle;
use crate::dtype::DType;
use crate::dtype::PType;
use crate::serde::ArrayChildren;
use crate::validity::Validity;
use crate::vtable;
use crate::vtable::VTable;
use crate::vtable::ValidityVTableFromValidityHelper;
use crate::vtable::validity_nchildren;
use crate::vtable::validity_to_child;
mod kernel;
mod operations;
mod validity;

use std::hash::Hash;
use std::hash::Hasher;

use vortex_buffer::Alignment;
use vortex_session::VortexSession;

use crate::Precision;
use crate::arrays::primitive::compute::rules::RULES;
use crate::hash::ArrayEq;
use crate::hash::ArrayHash;
use crate::stats::StatsSetRef;
use crate::vtable::ArrayId;

vtable!(Primitive);

impl VTable for PrimitiveVTable {
    type Array = PrimitiveArray;

    type Metadata = EmptyMetadata;
    type OperationsVTable = Self;
    type ValidityVTable = ValidityVTableFromValidityHelper;

    fn id(_array: &Self::Array) -> ArrayId {
        Self::ID
    }

    fn len(array: &PrimitiveArray) -> usize {
        array.buffer_handle().len() / array.ptype().byte_width()
    }

    fn dtype(array: &PrimitiveArray) -> &DType {
        &array.dtype
    }

    fn stats(array: &PrimitiveArray) -> StatsSetRef<'_> {
        array.stats_set.to_ref(array.as_ref())
    }

    fn array_hash<H: Hasher>(array: &PrimitiveArray, state: &mut H, precision: Precision) {
        array.dtype.hash(state);
        array.buffer.array_hash(state, precision);
        array.validity.array_hash(state, precision);
    }

    fn array_eq(array: &PrimitiveArray, other: &PrimitiveArray, precision: Precision) -> bool {
        array.dtype == other.dtype
            && array.buffer.array_eq(&other.buffer, precision)
            && array.validity.array_eq(&other.validity, precision)
    }

    fn nbuffers(_array: &PrimitiveArray) -> usize {
        1
    }

    fn buffer(array: &PrimitiveArray, idx: usize) -> BufferHandle {
        match idx {
            0 => array.buffer_handle().clone(),
            _ => vortex_panic!("PrimitiveArray buffer index {idx} out of bounds"),
        }
    }

    fn buffer_name(_array: &PrimitiveArray, idx: usize) -> Option<String> {
        match idx {
            0 => Some("values".to_string()),
            _ => None,
        }
    }

    fn nchildren(array: &PrimitiveArray) -> usize {
        validity_nchildren(&array.validity)
    }

    fn child(array: &PrimitiveArray, idx: usize) -> ArrayRef {
        match idx {
            0 => validity_to_child(&array.validity, array.len())
                .vortex_expect("PrimitiveArray child index out of bounds"),
            _ => vortex_panic!("PrimitiveArray child index {idx} out of bounds"),
        }
    }

    fn child_name(_array: &PrimitiveArray, _idx: usize) -> String {
        "validity".to_string()
    }

    fn metadata(_array: &PrimitiveArray) -> VortexResult<Self::Metadata> {
        Ok(EmptyMetadata)
    }

    fn serialize(_metadata: Self::Metadata) -> VortexResult<Option<Vec<u8>>> {
        Ok(Some(vec![]))
    }

    fn deserialize(
        _bytes: &[u8],
        _dtype: &DType,
        _len: usize,
        _buffers: &[BufferHandle],
        _session: &VortexSession,
    ) -> VortexResult<Self::Metadata> {
        Ok(EmptyMetadata)
    }

    fn build(
        dtype: &DType,
        len: usize,
        _metadata: &Self::Metadata,
        buffers: &[BufferHandle],
        children: &dyn ArrayChildren,
    ) -> VortexResult<PrimitiveArray> {
        if buffers.len() != 1 {
            vortex_bail!("Expected 1 buffer, got {}", buffers.len());
        }
        let buffer = buffers[0].clone();

        let validity = if children.is_empty() {
            Validity::from(dtype.nullability())
        } else if children.len() == 1 {
            let validity = children.get(0, &Validity::DTYPE, len)?;
            Validity::Array(validity)
        } else {
            vortex_bail!("Expected 0 or 1 child, got {}", children.len());
        };

        let ptype = PType::try_from(dtype)?;

        vortex_ensure!(
            buffer.is_aligned_to(Alignment::new(ptype.byte_width())),
            "Misaligned buffer cannot be used to build PrimitiveArray of {ptype}"
        );

        if buffer.len() != ptype.byte_width() * len {
            vortex_bail!(
                "Buffer length {} does not match expected length {} for {}, {}",
                buffer.len(),
                ptype.byte_width() * len,
                ptype.byte_width(),
                len,
            );
        }

        vortex_ensure!(
            buffer.is_aligned_to(Alignment::new(ptype.byte_width())),
            "PrimitiveArray::build: Buffer (align={}) must be aligned to {}",
            buffer.alignment(),
            ptype.byte_width()
        );

        // SAFETY: checked ahead of time
        unsafe {
            Ok(PrimitiveArray::new_unchecked_from_handle(
                buffer, ptype, validity,
            ))
        }
    }

    fn with_children(array: &mut Self::Array, children: Vec<ArrayRef>) -> VortexResult<()> {
        vortex_ensure!(
            children.len() <= 1,
            "PrimitiveArray can have at most 1 child (validity), got {}",
            children.len()
        );

        array.validity = if children.is_empty() {
            Validity::from(array.dtype().nullability())
        } else {
            Validity::Array(children.into_iter().next().vortex_expect("checked"))
        };

        Ok(())
    }

    fn execute(array: &Self::Array, _ctx: &mut ExecutionCtx) -> VortexResult<ExecutionStep> {
        Ok(ExecutionStep::Done(array.clone().into_array()))
    }

    fn reduce_parent(
        array: &Self::Array,
        parent: &ArrayRef,
        child_idx: usize,
    ) -> VortexResult<Option<ArrayRef>> {
        RULES.evaluate(array, parent, child_idx)
    }

    fn execute_parent(
        array: &Self::Array,
        parent: &ArrayRef,
        child_idx: usize,
        ctx: &mut ExecutionCtx,
    ) -> VortexResult<Option<ArrayRef>> {
        PARENT_KERNELS.execute(array, parent, child_idx, ctx)
    }
}

#[derive(Debug)]
pub struct PrimitiveVTable;

impl PrimitiveVTable {
    pub const ID: ArrayId = ArrayId::new_ref("vortex.primitive");
}