Enum Predicate 

pub enum Predicate {
    Compare {
        column: usize,
        op: Comparison,
        literal: Literal,
    },
    And(Box<Predicate>, Box<Predicate>),
}

A filter predicate in the bounded v1 grammar: column-vs-literal comparisons combined with AND.

Variants

Compare

column <op> literal

Fields

column: usize

Index of the column in the input schema.

op: Comparison

The comparison operator.

literal: Literal

The literal operand.

And(Box<Predicate>, Box<Predicate>)

Logical conjunction.

Implementations

impl Predicate

pub const fn compare(column: usize, op: Comparison, literal: Literal) -> Self

Builds a comparison predicate.

pub fn and(left: Predicate, right: Predicate) -> Self

Conjoins two predicates.

pub fn columns(&self) -> Vec<usize>

Every column index referenced, in evaluation order (duplicates kept).

pub fn leaf_count(&self) -> usize

Number of comparison leaves.

Trait Implementations

impl Clone for Predicate

fn clone(&self) -> Predicate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predicate

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Predicate

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Predicate

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Predicate

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Predicate