Enum datafusion::logical::Expr

pub enum Expr {
    Column(usize),
    Literal(ScalarValue),
    BinaryExpr {
        left: Rc<Expr>,
        op: Operator,
        right: Rc<Expr>,
    },
    IsNotNull(Rc<Expr>),
    IsNull(Rc<Expr>),
    Cast {
        expr: Rc<Expr>,
        data_type: DataType,
    },
    Sort {
        expr: Rc<Expr>,
        asc: bool,
    },
    ScalarFunction {
        name: String,
        args: Vec<Expr>,
        return_type: DataType,
    },
    AggregateFunction {
        name: String,
        args: Vec<Expr>,
        return_type: DataType,
    },
}

Relation Expression

Variants

Column(usize)

index into a value within the row or complex value

Literal(ScalarValue)

literal value

BinaryExpr

binary expression e.g. "age > 21"

Fields of BinaryExpr

left: Rc<Expr>
op: Operator
right: Rc<Expr>

IsNotNull(Rc<Expr>)

unary IS NOT NULL

IsNull(Rc<Expr>)

unary IS NULL

Cast

cast a value to a different type

Fields of Cast

expr: Rc<Expr>
data_type: DataType

Sort

sort expression

Fields of Sort

expr: Rc<Expr>
asc: bool

ScalarFunction

scalar function

Fields of ScalarFunction

name: String
args: Vec<Expr>
return_type: DataType

AggregateFunction

aggregate function

Fields of AggregateFunction

name: String
args: Vec<Expr>
return_type: DataType

Methods

impl Expr

pub fn get_type(&self, schema: &Schema) -> DataType

pub fn cast_to(     &self,     cast_to_type: &DataType,     schema: &Schema ) -> Result<Expr, String>

pub fn eq(&self, other: &Expr) -> Expr

pub fn not_eq(&self, other: &Expr) -> Expr

pub fn gt(&self, other: &Expr) -> Expr

pub fn gt_eq(&self, other: &Expr) -> Expr

pub fn lt(&self, other: &Expr) -> Expr

pub fn lt_eq(&self, other: &Expr) -> Expr

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for Expr

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Debug for Expr

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

Formats the value using the given formatter.