Struct datafusion_physical_expr::expressions::CastExpr

pub struct CastExpr { /* private fields */ }

CAST expression casts an expression to a specific data type and returns a runtime error on invalid cast

Implementations

impl CastExpr

pub fn new( expr: Arc<dyn PhysicalExpr>, cast_type: DataType, cast_options: Option<CastOptions<'static>> ) -> Self

Create a new CastExpr

pub fn expr(&self) -> &Arc<dyn PhysicalExpr>

The expression to cast

pub fn cast_type(&self) -> &DataType

The data type to cast to

pub fn cast_options(&self) -> &CastOptions<'static>

The cast options

Trait Implementations

impl Clone for CastExpr

fn clone(&self) -> CastExpr

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CastExpr

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

Formats the value using the given formatter.

impl Display for CastExpr

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

Formats the value using the given formatter.

impl PartialEq<dyn Any> for CastExpr

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

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

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

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

impl PhysicalExpr for CastExpr

fn as_any(&self) -> &dyn Any

Return a reference to Any that can be used for downcasting

fn get_ordering(&self, children: &[SortProperties]) -> SortProperties

A CastExpr preserves the ordering of its child.

fn data_type(&self, _input_schema: &Schema) -> Result<DataType>

Get the data type of this expression, given the schema of the input

fn nullable(&self, input_schema: &Schema) -> Result<bool>

Determine whether this expression is nullable, given the schema of the input

fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue>

Evaluate an expression against a RecordBatch

fn children(&self) -> Vec<Arc<dyn PhysicalExpr>>

Get a list of child PhysicalExpr that provide the input for this expr.

fn with_new_children( self: Arc<Self>, children: Vec<Arc<dyn PhysicalExpr>> ) -> Result<Arc<dyn PhysicalExpr>>

Returns a new PhysicalExpr where all children were replaced by new exprs.

fn evaluate_bounds(&self, children: &[&Interval]) -> Result<Interval>

Computes the output interval for the expression, given the input intervals.

fn propagate_constraints( &self, interval: &Interval, children: &[&Interval] ) -> Result<Option<Vec<Interval>>>

Updates bounds for child expressions, given a known interval for this expression.

fn dyn_hash(&self, state: &mut dyn Hasher)

Update the hash state with this expression requirements from Hash.

fn evaluate_selection( &self, batch: &RecordBatch, selection: &BooleanArray ) -> Result<ColumnarValue>

Evaluate an expression against a RecordBatch after first applying a validity array