vortex-array 0.73.0

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

use vortex_error::VortexResult;

use crate::ArrayRef;
use crate::Columnar;
use crate::ExecutionCtx;
use crate::IntoArray;
use crate::aggregate_fn::AggregateFnId;
use crate::aggregate_fn::AggregateFnVTable;
use crate::aggregate_fn::EmptyOptions;
use crate::dtype::DType;
use crate::dtype::Nullability;
use crate::scalar::Scalar;

/// Compute whether every value in an array is null.
///
/// Like other `all` aggregates, this is vacuously true for empty input.
#[derive(Clone, Debug)]
pub struct AllNull;

impl AggregateFnVTable for AllNull {
    type Options = EmptyOptions;
    type Partial = bool;

    fn id(&self) -> AggregateFnId {
        AggregateFnId::new("vortex.all_null")
    }

    fn serialize(&self, _options: &Self::Options) -> VortexResult<Option<Vec<u8>>> {
        Ok(None)
    }

    fn return_dtype(&self, _options: &Self::Options, _input_dtype: &DType) -> Option<DType> {
        Some(DType::Bool(Nullability::NonNullable))
    }

    fn partial_dtype(&self, options: &Self::Options, input_dtype: &DType) -> Option<DType> {
        self.return_dtype(options, input_dtype)
    }

    fn empty_partial(
        &self,
        _options: &Self::Options,
        _input_dtype: &DType,
    ) -> VortexResult<Self::Partial> {
        Ok(true)
    }

    fn combine_partials(&self, partial: &mut Self::Partial, other: Scalar) -> VortexResult<()> {
        *partial &= bool::try_from(&other)?;
        Ok(())
    }

    fn to_scalar(&self, partial: &Self::Partial) -> VortexResult<Scalar> {
        Ok(Scalar::bool(*partial, Nullability::NonNullable))
    }

    fn reset(&self, partial: &mut Self::Partial) {
        *partial = true;
    }

    fn is_saturated(&self, partial: &Self::Partial) -> bool {
        !*partial
    }

    fn try_accumulate(
        &self,
        state: &mut Self::Partial,
        batch: &ArrayRef,
        ctx: &mut ExecutionCtx,
    ) -> VortexResult<bool> {
        *state &= batch.invalid_count(ctx)? == batch.len();
        Ok(true)
    }

    fn accumulate(
        &self,
        partial: &mut Self::Partial,
        batch: &Columnar,
        ctx: &mut ExecutionCtx,
    ) -> VortexResult<()> {
        // Normal array dispatch is handled by `try_accumulate`, which always short-circuits.
        // Keep this fallback in sync for direct Columnar accumulation paths.
        *partial &= match batch {
            Columnar::Constant(c) => c.is_empty() || c.scalar().is_null(),
            Columnar::Canonical(c) => {
                let array = c.clone().into_array();
                array.invalid_count(ctx)? == array.len()
            }
        };
        Ok(())
    }

    fn finalize(&self, partials: ArrayRef) -> VortexResult<ArrayRef> {
        Ok(partials)
    }

    fn finalize_scalar(&self, partial: &Self::Partial) -> VortexResult<Scalar> {
        self.to_scalar(partial)
    }
}

#[cfg(test)]
mod tests {
    use vortex_error::VortexResult;

    use crate::IntoArray;
    use crate::LEGACY_SESSION;
    use crate::VortexSessionExecute;
    use crate::aggregate_fn::Accumulator;
    use crate::aggregate_fn::DynAccumulator;
    use crate::aggregate_fn::EmptyOptions;
    use crate::aggregate_fn::fns::all_null::AllNull;
    use crate::arrays::PrimitiveArray;
    use crate::dtype::DType;
    use crate::dtype::Nullability;
    use crate::dtype::PType;

    #[test]
    fn all_null_aggregate_fn() -> VortexResult<()> {
        let mut ctx = LEGACY_SESSION.create_execution_ctx();
        let dtype = DType::Primitive(PType::I32, Nullability::Nullable);
        let mut acc = Accumulator::try_new(AllNull, EmptyOptions, dtype)?;

        let batch = PrimitiveArray::from_option_iter::<i32, _>([None, None, None]).into_array();
        acc.accumulate(&batch, &mut ctx)?;

        assert!(bool::try_from(&acc.finish()?)?);
        Ok(())
    }

    #[test]
    fn all_null_false_with_non_nulls() -> VortexResult<()> {
        let mut ctx = LEGACY_SESSION.create_execution_ctx();
        let dtype = DType::Primitive(PType::I32, Nullability::Nullable);
        let mut acc = Accumulator::try_new(AllNull, EmptyOptions, dtype)?;

        let batch = PrimitiveArray::from_option_iter([Some(1i32), None, Some(3)]).into_array();
        acc.accumulate(&batch, &mut ctx)?;

        assert!(!bool::try_from(&acc.finish()?)?);
        Ok(())
    }

    #[test]
    fn all_null_true_for_empty_input() -> VortexResult<()> {
        let mut ctx = LEGACY_SESSION.create_execution_ctx();
        let dtype = DType::Primitive(PType::I32, Nullability::Nullable);
        let mut acc = Accumulator::try_new(AllNull, EmptyOptions, dtype)?;

        let batch = PrimitiveArray::empty::<i32>(Nullability::Nullable).into_array();
        acc.accumulate(&batch, &mut ctx)?;

        assert!(bool::try_from(&acc.finish()?)?);
        Ok(())
    }
}