Enum ScanPredicate 

pub enum ScanPredicate {
    ColumnEqual {
        column: Arc<str>,
        value: Value,
    },
    ColumnRange {
        column: Arc<str>,
        lower: Option<Value>,
        upper: Option<Value>,
        include_lower: bool,
        include_upper: bool,
    },
}

A single-column comparison predicate pushed from the query layer into a physical scan.

This is the whitelist of filter conjuncts the planner can push into the storage layer. A list of predicates forms a conjunction (every predicate must match). Rows with a missing property never match, mirroring the query engine’s NULL semantics where comparisons against NULL are false. The original filter expression still runs on top of the scan, so the pushdown is a pure pre-filter and can never change results.

Variants

ColumnEqual

column = value

Fields

column: Arc<str>

value: Value

ColumnRange

column bounded by constants (either bound may be absent).

Fields

column: Arc<str>

lower: Option<Value>

upper: Option<Value>

include_lower: bool

include_upper: bool

Implementations

impl ScanPredicate

pub fn matches(&self, props: &[(Arc<str>, Value)]) -> bool

Whether the predicate matches the given property set.

Properties are a (name, value) slice in projection order. A missing column (or any non-scalar comparison) never matches.

pub fn column(&self) -> &str

The property column this predicate compares.

pub fn column_arc(&self) -> Arc<str>

pub fn merged_ranges(predicates: &[ScanPredicate]) -> Vec<PredicateRange>

Merge pushed predicates into one value range per referenced column.

The result is the conjunction of all predicates on that column: bounds only tighten. Columns compared with mixed orderings collapse into a single [lower, upper] interval; an equality contributes an empty interval.

impl ScanPredicate

pub fn matches_column(&self, column: &ColumnValues, idx: usize) -> bool

Columnar variant of matches: evaluate against one ColumnValues at row idx. A null value never matches, mirroring the row-based NULL semantics.

pub fn matches_value(&self, value: &Value) -> bool

Evaluate the predicate against a single decoded value.

Column-scan pushdown entry point: the caller already selected the predicate column, so no property-set lookup happens here. A null value never reaches this method; callers return false for nulls to keep bitmap null semantics.

Trait Implementations

impl Clone for ScanPredicate

fn clone(&self) -> ScanPredicate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ScanPredicate

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl PartialEq for ScanPredicate

fn eq(&self, other: &ScanPredicate) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScanPredicate