NumericKernels

llkv_table

Struct NumericKernels 

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pub struct NumericKernels;
Expand description

Centralizes the numeric kernels applied to scalar expressions so they can be tuned without touching the surrounding table scan logic.

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impl ScalarEvaluator

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pub fn collect_fields<F>( expr: &ScalarExpr<F>, acc: &mut HashSet<F, FxBuildHasher>, )
where F: Hash + Eq + Copy,

Collect every field referenced by the scalar expression into acc.

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pub fn prepare_numeric_arrays<F>( arrays: &HashMap<F, Arc<dyn Array>, FxBuildHasher>, _row_count: usize, ) -> HashMap<F, Arc<dyn Array>, FxBuildHasher>
where F: Hash + Eq + Copy,

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pub fn extract_affine<F>(expr: &ScalarExpr<F>) -> Option<AffineExpr<F>>
where F: Hash + Eq + Copy,

Attempts to represent the expression as scale * column + offset. Returns None when the expression depends on multiple columns or is non-linear.

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pub fn extract_affine_simplified<F>( expr: &ScalarExpr<F>, ) -> Option<AffineExpr<F>>
where F: Hash + Eq + Copy,

Variant of extract_affine that assumes expr is already simplified.

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pub fn evaluate_value<F>( expr: &ScalarExpr<F>, idx: usize, arrays: &HashMap<F, Arc<dyn Array>, FxBuildHasher>, ) -> Result<Arc<dyn Array>, Error>
where F: Hash + Eq + Copy,

Evaluate a scalar expression for the row at idx using the provided numeric arrays.

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pub fn evaluate_batch<F>( expr: &ScalarExpr<F>, len: usize, arrays: &HashMap<F, Arc<dyn Array>, FxBuildHasher>, ) -> Result<Arc<dyn Array>, Error>
where F: Hash + Eq + Copy + Debug,

Evaluate a scalar expression for every row in the batch.

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pub fn evaluate_batch_simplified<F>( expr: &ScalarExpr<F>, len: usize, arrays: &HashMap<F, Arc<dyn Array>, FxBuildHasher>, ) -> Result<Arc<dyn Array>, Error>
where F: Hash + Eq + Copy,

Evaluate a scalar expression that has already been simplified.

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pub fn passthrough_column<F>(expr: &ScalarExpr<F>) -> Option<F>
where F: Hash + Eq + Copy,

Returns the column referenced by an expression when it’s a direct or additive identity passthrough.

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pub fn simplify<F>(expr: &ScalarExpr<F>) -> ScalarExpr<F>
where F: Hash + Eq + Copy,

Simplify an expression by constant folding and identity removal.

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pub fn evaluate_constant_literal_expr<F>( expr: &ScalarExpr<F>, ) -> Result<Option<Literal>, Error>
where F: Hash + Eq + Copy,

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pub fn evaluate_constant_literal_non_numeric<F>( expr: &ScalarExpr<F>, ) -> Result<Option<Literal>, Error>
where F: Hash + Eq + Copy,

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pub fn is_supported_numeric(dtype: &DataType) -> bool

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