algeon-datafusion 0.1.2

DataFusion physical-plan adapter for native GPU execution.
Documentation 
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//! Lowering of DataFusion scalar literals into native literal values.

use std::sync::Arc;

use arrow::datatypes::{DataType, IntervalMonthDayNanoType, TimeUnit};
use cudf::interop::arrow_host::is_supported_arrow_type;
use datafusion::{
    common::ScalarValue,
    physical_expr::{PhysicalExpr, expressions::Literal},
};
use query_planning::expr::LiteralValue as NativeLiteralValue;

use crate::capability::CapabilityReason;

/// Chooses the fallback category for literal lowering failures.
#[derive(Debug, Clone, Copy)]
pub(super) enum NativeLiteralContext {
    Expression,
    SourceValue,
}

impl NativeLiteralContext {
    fn fallback_reason(self) -> CapabilityReason {
        match self {
            Self::Expression => CapabilityReason::UnsupportedExpression,
            Self::SourceValue => CapabilityReason::UnsupportedType,
        }
    }
}

pub(super) fn native_literal_value(
    value: &ScalarValue,
    context: NativeLiteralContext,
) -> Result<NativeLiteralValue, CapabilityReason> {
    let literal = match value {
        ScalarValue::Boolean(Some(value)) => NativeLiteralValue::Boolean(*value),
        ScalarValue::Int8(Some(value)) => NativeLiteralValue::Int8(*value),
        ScalarValue::Int16(Some(value)) => NativeLiteralValue::Int16(*value),
        ScalarValue::Int32(Some(value)) => NativeLiteralValue::Int32(*value),
        ScalarValue::Int64(Some(value)) => NativeLiteralValue::Int64(*value),
        ScalarValue::UInt8(Some(value)) => NativeLiteralValue::UInt8(*value),
        ScalarValue::UInt16(Some(value)) => NativeLiteralValue::UInt16(*value),
        ScalarValue::UInt32(Some(value)) => NativeLiteralValue::UInt32(*value),
        ScalarValue::UInt64(Some(value)) => NativeLiteralValue::UInt64(*value),
        ScalarValue::Float32(Some(value)) => NativeLiteralValue::Float32(*value),
        ScalarValue::Float64(Some(value)) => NativeLiteralValue::Float64(*value),
        // Utf8View has no distinct native literal; non-null values are canonicalized to Utf8.
        ScalarValue::Utf8(Some(value)) | ScalarValue::Utf8View(Some(value)) => NativeLiteralValue::Utf8(value.clone()),
        ScalarValue::LargeUtf8(Some(value)) => NativeLiteralValue::LargeUtf8(value.clone()),
        ScalarValue::Decimal128(Some(raw), precision, scale) => {
            NativeLiteralValue::Decimal128 { raw: *raw, precision: *precision, scale: *scale }
        },
        ScalarValue::Date32(Some(value)) => NativeLiteralValue::Date32(*value),
        ScalarValue::Date64(Some(value)) => NativeLiteralValue::Date64(*value),
        ScalarValue::Time32Second(Some(raw)) => NativeLiteralValue::Time32 { raw: *raw, unit: TimeUnit::Second },
        ScalarValue::Time32Millisecond(Some(raw)) => {
            NativeLiteralValue::Time32 { raw: *raw, unit: TimeUnit::Millisecond }
        },
        ScalarValue::Time64Microsecond(Some(raw)) => {
            NativeLiteralValue::Time64 { raw: *raw, unit: TimeUnit::Microsecond }
        },
        ScalarValue::Time64Nanosecond(Some(raw)) => {
            NativeLiteralValue::Time64 { raw: *raw, unit: TimeUnit::Nanosecond }
        },
        ScalarValue::TimestampSecond(Some(raw), _) => {
            NativeLiteralValue::Timestamp { raw: *raw, unit: TimeUnit::Second }
        },
        ScalarValue::TimestampMillisecond(Some(raw), _) => {
            NativeLiteralValue::Timestamp { raw: *raw, unit: TimeUnit::Millisecond }
        },
        ScalarValue::TimestampMicrosecond(Some(raw), _) => {
            NativeLiteralValue::Timestamp { raw: *raw, unit: TimeUnit::Microsecond }
        },
        ScalarValue::TimestampNanosecond(Some(raw), _) => {
            NativeLiteralValue::Timestamp { raw: *raw, unit: TimeUnit::Nanosecond }
        },
        ScalarValue::DurationSecond(Some(raw)) => NativeLiteralValue::Duration { raw: *raw, unit: TimeUnit::Second },
        ScalarValue::DurationMillisecond(Some(raw)) => {
            NativeLiteralValue::Duration { raw: *raw, unit: TimeUnit::Millisecond }
        },
        ScalarValue::DurationMicrosecond(Some(raw)) => {
            NativeLiteralValue::Duration { raw: *raw, unit: TimeUnit::Microsecond }
        },
        ScalarValue::DurationNanosecond(Some(raw)) => {
            NativeLiteralValue::Duration { raw: *raw, unit: TimeUnit::Nanosecond }
        },
        ScalarValue::IntervalMonthDayNano(Some(value)) => {
            let (months, days, nanoseconds) = IntervalMonthDayNanoType::to_parts(*value);
            NativeLiteralValue::IntervalMonthDayNano { months, days, nanoseconds }
        },
        ScalarValue::Boolean(None) => NativeLiteralValue::Null(DataType::Boolean),
        ScalarValue::Int8(None) => NativeLiteralValue::Null(DataType::Int8),
        ScalarValue::Int16(None) => NativeLiteralValue::Null(DataType::Int16),
        ScalarValue::Int32(None) => NativeLiteralValue::Null(DataType::Int32),
        ScalarValue::Int64(None) => NativeLiteralValue::Null(DataType::Int64),
        ScalarValue::UInt8(None) => NativeLiteralValue::Null(DataType::UInt8),
        ScalarValue::UInt16(None) => NativeLiteralValue::Null(DataType::UInt16),
        ScalarValue::UInt32(None) => NativeLiteralValue::Null(DataType::UInt32),
        ScalarValue::UInt64(None) => NativeLiteralValue::Null(DataType::UInt64),
        ScalarValue::Float32(None) => NativeLiteralValue::Null(DataType::Float32),
        ScalarValue::Float64(None) => NativeLiteralValue::Null(DataType::Float64),
        ScalarValue::Utf8(None) => NativeLiteralValue::Null(DataType::Utf8),
        // Typed Utf8View null is preserved; native dtype maps it to a cuDF string.
        ScalarValue::Utf8View(None) => NativeLiteralValue::Null(DataType::Utf8View),
        ScalarValue::LargeUtf8(None) => NativeLiteralValue::Null(DataType::LargeUtf8),
        ScalarValue::Decimal128(None, precision, scale) => {
            NativeLiteralValue::Null(DataType::Decimal128(*precision, *scale))
        },
        ScalarValue::Date32(None) => NativeLiteralValue::Null(DataType::Date32),
        ScalarValue::Date64(None) => NativeLiteralValue::Null(DataType::Date64),
        ScalarValue::Time32Second(None) => NativeLiteralValue::Null(DataType::Time32(TimeUnit::Second)),
        ScalarValue::Time32Millisecond(None) => NativeLiteralValue::Null(DataType::Time32(TimeUnit::Millisecond)),
        ScalarValue::Time64Microsecond(None) => NativeLiteralValue::Null(DataType::Time64(TimeUnit::Microsecond)),
        ScalarValue::Time64Nanosecond(None) => NativeLiteralValue::Null(DataType::Time64(TimeUnit::Nanosecond)),
        ScalarValue::TimestampSecond(None, timezone) => {
            NativeLiteralValue::Null(DataType::Timestamp(TimeUnit::Second, timezone.clone()))
        },
        ScalarValue::TimestampMillisecond(None, timezone) => {
            NativeLiteralValue::Null(DataType::Timestamp(TimeUnit::Millisecond, timezone.clone()))
        },
        ScalarValue::TimestampMicrosecond(None, timezone) => {
            NativeLiteralValue::Null(DataType::Timestamp(TimeUnit::Microsecond, timezone.clone()))
        },
        ScalarValue::TimestampNanosecond(None, timezone) => {
            NativeLiteralValue::Null(DataType::Timestamp(TimeUnit::Nanosecond, timezone.clone()))
        },
        ScalarValue::DurationSecond(None) => NativeLiteralValue::Null(DataType::Duration(TimeUnit::Second)),
        ScalarValue::DurationMillisecond(None) => NativeLiteralValue::Null(DataType::Duration(TimeUnit::Millisecond)),
        ScalarValue::DurationMicrosecond(None) => NativeLiteralValue::Null(DataType::Duration(TimeUnit::Microsecond)),
        ScalarValue::DurationNanosecond(None) => NativeLiteralValue::Null(DataType::Duration(TimeUnit::Nanosecond)),
        _ => return Err(context.fallback_reason()),
    };

    if native_literal_type_is_supported(&literal, context) { Ok(literal) } else { Err(context.fallback_reason()) }
}

pub(super) fn validate_native_literal(
    value: &ScalarValue,
    context: NativeLiteralContext,
) -> Result<(), CapabilityReason> {
    native_literal_value(value, context).map(|_literal| ())
}

pub(super) fn parse_yyyy_mm_dd_date32(value: &str) -> Option<i32> {
    let bytes = value.as_bytes();
    if bytes.len() != 10 || bytes[4] != b'-' || bytes[7] != b'-' {
        return None;
    }
    let year = parse_digits_i32(&bytes[0..4])?;
    let month = parse_digits_i32(&bytes[5..7])?;
    let day = parse_digits_i32(&bytes[8..10])?;
    if !(1..=12).contains(&month) || !(1..=days_in_month(year, month)).contains(&day) {
        return None;
    }
    Some(days_from_civil(year, month, day))
}

pub(crate) fn literal_string(expr: &Arc<dyn PhysicalExpr>) -> Result<String, CapabilityReason> {
    let Some(literal) = expr.downcast_ref::<Literal>() else {
        return Err(CapabilityReason::UnsupportedExpression);
    };
    match literal.value() {
        ScalarValue::Utf8(Some(value)) | ScalarValue::LargeUtf8(Some(value)) | ScalarValue::Utf8View(Some(value)) => {
            Ok(value.clone())
        },
        _ => Err(CapabilityReason::UnsupportedExpression),
    }
}

pub(crate) fn literal_i32(expr: &Arc<dyn PhysicalExpr>) -> Result<i32, CapabilityReason> {
    let Some(literal) = expr.downcast_ref::<Literal>() else {
        return Err(CapabilityReason::UnsupportedExpression);
    };
    match literal.value() {
        ScalarValue::Int8(Some(value)) => Ok(i32::from(*value)),
        ScalarValue::Int16(Some(value)) => Ok(i32::from(*value)),
        ScalarValue::Int32(Some(value)) => Ok(*value),
        ScalarValue::Int64(Some(value)) => {
            i32::try_from(*value).map_err(|_error| CapabilityReason::UnsupportedExpression)
        },
        ScalarValue::UInt8(Some(value)) => Ok(i32::from(*value)),
        ScalarValue::UInt16(Some(value)) => Ok(i32::from(*value)),
        ScalarValue::UInt32(Some(value)) => {
            i32::try_from(*value).map_err(|_error| CapabilityReason::UnsupportedExpression)
        },
        ScalarValue::UInt64(Some(value)) => {
            i32::try_from(*value).map_err(|_error| CapabilityReason::UnsupportedExpression)
        },
        _ => Err(CapabilityReason::UnsupportedExpression),
    }
}

pub(crate) fn is_interval_literal_expr(expr: &Arc<dyn PhysicalExpr>) -> bool {
    expr.downcast_ref::<Literal>()
        .is_some_and(|literal| matches!(literal.value(), ScalarValue::IntervalMonthDayNano(Some(_))))
}

fn parse_digits_i32(bytes: &[u8]) -> Option<i32> {
    bytes.iter().try_fold(0i32, |acc, byte| {
        if byte.is_ascii_digit() { acc.checked_mul(10)?.checked_add(i32::from(byte - b'0')) } else { None }
    })
}

fn days_in_month(year: i32, month: i32) -> i32 {
    match month {
        1 | 3 | 5 | 7 | 8 | 10 | 12 => 31,
        4 | 6 | 9 | 11 => 30,
        2 if is_leap_year(year) => 29,
        2 => 28,
        _ => 0,
    }
}

fn is_leap_year(year: i32) -> bool {
    (year % 4 == 0 && year % 100 != 0) || year % 400 == 0
}

fn days_from_civil(year: i32, month: i32, day: i32) -> i32 {
    let year = year - i32::from(month <= 2);
    let era = if year >= 0 { year } else { year - 399 } / 400;
    let year_of_era = year - era * 400;
    let month = month + if month > 2 { -3 } else { 9 };
    let day_of_year = (153 * month + 2) / 5 + day - 1;
    let day_of_era = year_of_era * 365 + year_of_era / 4 - year_of_era / 100 + day_of_year;
    era * 146_097 + day_of_era - 719_468
}

fn native_literal_type_is_supported(literal: &NativeLiteralValue, context: NativeLiteralContext) -> bool {
    if matches!(literal, NativeLiteralValue::IntervalMonthDayNano { .. }) {
        return matches!(context, NativeLiteralContext::Expression);
    }
    is_supported_arrow_type(&literal.data_type())
}