Enum ConcatStrNullBehavior 

pub enum ConcatStrNullBehavior {
    Propagate,
    Ignore,
    Replace(String),
}

Expression AST and supporting enums. Null treatment for Expr::ConcatStr.

Variants

Propagate

A null in any input produces a null output for that row.

Ignore

Omit null inputs; a row whose inputs are all null remains null.

Replace(String)

Replace every null input with this string before concatenation.

Trait Implementations

impl Clone for ConcatStrNullBehavior

fn clone(&self) -> ConcatStrNullBehavior

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConcatStrNullBehavior

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

Formats the value using the given formatter.

impl Eq for ConcatStrNullBehavior

impl PartialEq for ConcatStrNullBehavior

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ConcatStrNullBehavior