Struct ConcatFunc 

pub struct ConcatFunc { /* private fields */ }

Available on crate feature string_expressions only.

Implementations

impl ConcatFunc

pub fn new() -> Self

Trait Implementations

impl Debug for ConcatFunc

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

Formats the value using the given formatter.

impl Default for ConcatFunc

fn default() -> Self

Returns the “default value” for a type.

impl Hash for ConcatFunc

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ConcatFunc

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl ScalarUDFImpl for ConcatFunc

fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue>

Concatenates the text representations of all the arguments. NULL arguments are ignored. concat(‘abcde’, 2, NULL, 22) = ‘abcde222’

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

Simplify the concat function by

1. filtering out all null literals
2. concatenating contiguous literal arguments

For example: concat(col(a), 'hello ', 'world', col(b), null) will be optimized to concat(col(a), 'hello world', col(b))

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 a Signature describing the argument types for which this function has an implementation, and the function’s Volatility.

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

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

fn documentation(&self) -> Option<&Documentation>

Returns the documentation for this Scalar UDF.

fn preserves_lex_ordering(&self, _inputs: &[ExprProperties]) -> Result<bool>

Returns true if the function preserves lexicographical ordering based on the input ordering.

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

Returns any aliases (alternate names) for this function.

fn display_name(&self, args: &[Expr]) -> Result<String, DataFusionError>

👎Deprecated since 50.0.0: This method is unused and will be removed in a future release

Returns the user-defined display name of function, given the arguments

fn schema_name(&self, args: &[Expr]) -> Result<String, DataFusionError>

Returns the name of the column this expression would create

fn return_field_from_args( &self, args: ReturnFieldArgs<'_>, ) -> Result<Arc<Field>, DataFusionError>

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

fn is_nullable(&self, _args: &[Expr], _schema: &dyn ExprSchema) -> bool

👎Deprecated since 45.0.0: Use return_field_from_args instead. if you use is_nullable that returns non-nullable with return_type, you would need to switch to return_field_from_args, you might have error

fn short_circuits(&self) -> bool

Returns true if some of this exprs subexpressions may not be evaluated and thus any side effects (like divide by zero) may not be encountered.

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

Computes the output Interval for a ScalarUDFImpl, given the input intervals.

fn propagate_constraints( &self, _interval: &Interval, _inputs: &[&Interval], ) -> Result<Option<Vec<Interval>>, DataFusionError>

Updates bounds for child expressions, given a known Intervals for this function.

fn output_ordering( &self, inputs: &[ExprProperties], ) -> Result<SortProperties, DataFusionError>

Calculates the SortProperties of this function based on its children’s properties.

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

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

impl Eq for ConcatFunc

impl StructuralPartialEq for ConcatFunc