Struct datafusion::physical_plan::expressions::TryCastExpr

pub struct TryCastExpr { /* private fields */ }

TRY_CAST expression casts an expression to a specific data type and retuns NULL on invalid cast

Implementations

impl TryCastExpr

pub fn new(
    expr: Arc<dyn PhysicalExpr + 'static>,
    cast_type: DataType
) -> TryCastExpr

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 TryCastExpr

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

Formats the value using the given formatter.

impl Display for TryCastExpr

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

Formats the value using the given formatter.

impl PartialEq<dyn Any + 'static> for TryCastExpr

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 TryCastExpr

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<TryCastExpr>,
    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 boundaries(&self, context: &AnalysisContext) -> Option<ExprBoundaries>

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