Enum NullOrdering 

pub enum NullOrdering {
    NullsMax,
    NullsMin,
    NullsFirst,
    NullsLast,
}

Represents the null ordering for sorting expressions.

Variants

NullsMax

Nulls appear last in ascending order.

NullsMin

Nulls appear first in descending order.

NullsFirst

Nulls appear first.

NullsLast

Nulls appear last.

Implementations

impl NullOrdering

pub fn nulls_first(&self, asc: bool) -> bool

Evaluates the null ordering based on the given ascending flag.

Returns

• true if nulls should appear first.
• false if nulls should appear last.

Trait Implementations

impl Clone for NullOrdering

fn clone(&self) -> NullOrdering

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NullOrdering

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

Formats the value using the given formatter.

impl From<&str> for NullOrdering

fn from(s: &str) -> Self

Converts to this type from the input type.

impl FromStr for NullOrdering

type Err = DataFusionError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self>

Parses a string s to return a value of this type.

impl Copy for NullOrdering