Struct datafusion::functions_window::row_number::RowNumber

pub struct RowNumber { /* private fields */ }

row_number expression

Implementations

impl RowNumber

pub fn new() -> RowNumber

Create a new row_number function

Trait Implementations

impl Debug for RowNumber

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

Formats the value using the given formatter.

impl Default for RowNumber

fn default() -> RowNumber

Returns the “default value” for a type.

impl WindowUDFImpl for RowNumber

fn as_any(&self) -> &(dyn Any + 'static)

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, DataFusionError>

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

fn partition_evaluator( &self, ) -> Result<Box<dyn PartitionEvaluator>, DataFusionError>

Invoke the function, returning the PartitionEvaluator instance

fn nullable(&self) -> bool

Allows customizing nullable of column for this window UDF.

fn sort_options(&self) -> Option<SortOptions>

Allows the window UDF to define a custom result ordering.

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

Returns any aliases (alternate names) for this function.

fn simplify( &self, ) -> Option<Box<dyn Fn(WindowFunction, &dyn SimplifyInfo) -> Result<Expr, DataFusionError>>>

Optionally apply per-UDWF simplification / rewrite rules.

fn equals(&self, other: &dyn WindowUDFImpl) -> bool

Return true if this window UDF is equal to the other.

fn hash_value(&self) -> u64

Returns a hash value for this window UDF.

fn coerce_types( &self, _arg_types: &[DataType], ) -> Result<Vec<DataType>, DataFusionError>

Coerce arguments of a function call to types that the function can evaluate.