Struct ScanPredicate 

pub struct ScanPredicate {
    pub col_idx: usize,
    pub op: PredicateOp,
    pub value: PredicateValue,
}

A predicate on a single column for block-level pushdown.

Fields

col_idx: usize

Column index in the schema.

op: PredicateOp

The comparison operation.

value: PredicateValue

The threshold value.

Implementations

impl ScanPredicate

pub fn gt(col_idx: usize, value: f64) -> Self

Create a predicate: column > value (numeric).

pub fn gte(col_idx: usize, value: f64) -> Self

Create a predicate: column >= value (numeric).

pub fn lt(col_idx: usize, value: f64) -> Self

Create a predicate: column < value (numeric).

pub fn lte(col_idx: usize, value: f64) -> Self

Create a predicate: column <= value (numeric).

pub fn eq(col_idx: usize, value: f64) -> Self

Create a predicate: column = value (numeric).

pub fn not_eq(col_idx: usize, value: f64) -> Self

Create a predicate: column != value (numeric). Named not_eq to avoid conflict with PartialEq::ne.

pub fn str_eq(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column = value (string, lexicographic).

pub fn str_not_eq(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column != value (string, lexicographic).

pub fn str_gt(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column > value (string, lexicographic).

pub fn str_gte(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column >= value (string, lexicographic).

pub fn str_lt(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column < value (string, lexicographic).

pub fn str_lte(col_idx: usize, value: impl Into<String>) -> Self

Create a predicate: column <= value (string, lexicographic).

pub fn can_skip_block(&self, stats: &BlockStats) -> bool

Whether a block can be entirely skipped based on its statistics.

Returns true if the block provably contains no matching rows. Returns false if the block might contain matching rows (must scan).

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

Formats the value using the given formatter.