Enum Predicate 

pub enum Predicate {
    Eq {
        column: String,
        value: String,
    },
    Ne {
        column: String,
        value: String,
    },
    Lt {
        column: String,
        value: String,
    },
    Le {
        column: String,
        value: String,
    },
    Gt {
        column: String,
        value: String,
    },
    Ge {
        column: String,
        value: String,
    },
    Between {
        column: String,
        min: String,
        max: String,
    },
    In {
        column: String,
        values: Vec<String>,
    },
    Like {
        column: String,
        pattern: String,
    },
    IsNull {
        column: String,
    },
    IsNotNull {
        column: String,
    },
    And(Box<Predicate>, Box<Predicate>),
    Or(Box<Predicate>, Box<Predicate>),
    Not(Box<Predicate>),
}

Query predicate for cost estimation

Variants

Eq

Equality: column = value

Fields

column: String

value: String

Ne

Inequality: column != value

Fields

column: String

value: String

Lt

Less than: column < value

Fields

column: String

value: String

Le

Less than or equal: column <= value

Fields

column: String

value: String

Gt

Greater than: column > value

Fields

column: String

value: String

Ge

Greater than or equal: column >= value

Fields

column: String

value: String

Between

Between: column BETWEEN min AND max

Fields

column: String

min: String

max: String

In

In list: column IN (v1, v2, …)

Fields

column: String

values: Vec<String>

Like

Like: column LIKE pattern

Fields

column: String

pattern: String

IsNull

Is null: column IS NULL

Fields

column: String

IsNotNull

Is not null: column IS NOT NULL

Fields

column: String

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

And: pred1 AND pred2

Or(Box<Predicate>, Box<Predicate>)

Or: pred1 OR pred2

Not(Box<Predicate>)

Not: NOT pred

Implementations

impl Predicate

pub fn referenced_columns(&self) -> HashSet<String>

Get columns referenced by this predicate

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.