Enum BinaryPredicateOp 

pub enum BinaryPredicateOp {
    LessThan,
    GreaterThan,
    Equal,
    Distinct,
    In,
}

A binary predicate operator.

The ordering and equality comparisons follow SQL three-valued logic, so a NULL operand yields NULL rather than false. Distinct and In instead tolerate NULL and always answer true or false.

Variants

LessThan

left < right.

GreaterThan

left > right.

Equal

left = right.

Distinct

SQL left IS DISTINCT FROM right: null-safe inequality, treating NULL as an ordinary value. DISTINCT(1, 1) and DISTINCT(NULL, NULL) are false; DISTINCT(NULL, 1) is true.

In

SQL left IN (elements): returns false when left is NULL. Otherwise, it returns true when left equals any element and false when none match. NULL elements never match. left must be a literal, and the elements are either a list-typed column or an Expression::Literal holding a Scalar::Array, never a list of expressions or a subquery:

2 IN (1, 2, 3)         -- literal elements
2 IN (SELECT ...)      -- unsupported: no subquery form
col IN (1, 2, 3)       -- unsupported: the left operand must be a literal

Testing a literal against a list column is the shape data skipping uses, and it is the reason the operands sit this way around rather than the more familiar column-on-the-left form.

Trait Implementations

impl Clone for BinaryPredicateOp

fn clone(&self) -> BinaryPredicateOp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BinaryPredicateOp

impl Debug for BinaryPredicateOp

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BinaryPredicateOp

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for BinaryPredicateOp

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

Formats the value using the given formatter.

impl Eq for BinaryPredicateOp

impl From<BinaryPredicateOp> for BinaryPredicateOp

Available on crate feature declarative-plans only.

fn from(op: BinaryPredicateOp) -> Self

Converts to this type from the input type.

impl Hash for BinaryPredicateOp

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for BinaryPredicateOp

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for BinaryPredicateOp

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 BinaryPredicateOp