Struct datafusion::physical_plan::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 + 'static>, cast_type: DataType, cast_options: CastOptions ) -> CastExpr

Create a new CastExpr

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

The expression to cast

pub fn cast_type(&self) -> &DataType

The data type to cast to

Trait Implementations

impl Debug for CastExpr

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

Formats the value using the given formatter.

impl Display for CastExpr

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

Formats the value using the given formatter.

impl PartialEq<dyn Any + 'static> for CastExpr

fn eq(&self, other: &(dyn Any + 'static)) -> 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 + 'static)

Return a reference to Any that can be used for downcasting

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

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

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

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

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

Evaluate an expression against a RecordBatch

fn children(&self) -> Vec<Arc<dyn PhysicalExpr + 'static>, Global>

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

fn with_new_children( self: Arc<CastExpr>, children: Vec<Arc<dyn PhysicalExpr + 'static>, Global> ) -> Result<Arc<dyn PhysicalExpr + 'static>, DataFusionError>

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

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

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

fn analyze(&self, context: AnalysisContext) -> AnalysisContext

Return the boundaries of this expression. This method (and all the related APIs) are experimental and subject to change.