Struct datafusion_functions::core::nullif::NullIfFunc

pub struct NullIfFunc { /* private fields */ }

Implementations

impl NullIfFunc

pub fn new() -> Self

Trait Implementations

impl Debug for NullIfFunc

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

Formats the value using the given formatter.

impl Default for NullIfFunc

fn default() -> Self

Returns the “default value” for a type.

impl ScalarUDFImpl for NullIfFunc

fn as_any(&self) -> &dyn Any

Returns this object as an Any trait object

fn name(&self) -> &str

Returns this function’s name

fn signature(&self) -> &Signature

Returns the function’s Signature for information about what input types are accepted and the function’s Volatility.

fn return_type(&self, arg_types: &[DataType]) -> Result<DataType>

What DataType will be returned by this function, given the types of the arguments.

fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue>

Invoke the function on args, returning the appropriate result

fn return_type_from_exprs( &self, _args: &[Expr], _schema: &dyn ExprSchema, arg_types: &[DataType] ) -> Result<DataType, DataFusionError>

What DataType will be returned by this function, given the arguments?

fn aliases(&self) -> &[String]

Returns any aliases (alternate names) for this function.

fn monotonicity(&self) -> Result<Option<Vec<Option<bool>>>, DataFusionError>

This function specifies monotonicity behaviors for User defined scalar functions.

fn simplify( &self, args: Vec<Expr>, _info: &dyn SimplifyInfo ) -> Result<ExprSimplifyResult, DataFusionError>

Optionally apply per-UDF simplification / rewrite rules.