Enum PredicateClass 

pub enum PredicateClass {
    LookupOnly,
    StreamOnly,
    CrossReference,
    Constant,
}

Classification of a predicate based on which side(s) it references.

Variants

LookupOnly

References only lookup table columns — candidate for pushdown.

StreamOnly

References only stream columns — evaluate locally.

CrossReference

References columns from both sides — evaluate locally.

Constant

References no columns (constant expression) — evaluate locally.

Trait Implementations

impl Clone for PredicateClass

fn clone(&self) -> PredicateClass

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PredicateClass

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

Formats the value using the given formatter.

impl PartialEq for PredicateClass

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PredicateClass

impl Eq for PredicateClass

impl StructuralPartialEq for PredicateClass