Enum NullHandling 

#[repr(i32)]
pub enum NullHandling {
    Preserve = 0,
    Drop = 1,
    PreserveAndExpandEmpty = 2,
}

Variants

Preserve = 0

Preserve nulls; empty lists produce no rows. The historical default.

Drop = 1

Drop both null and empty lists from the output.

PreserveAndExpandEmpty = 2

Preserve nulls, and additionally expand empty lists into a single NULL output row (outer-unnest semantics).

Implementations

impl NullHandling

pub const fn is_valid(value: i32) -> bool

Returns true if value is a variant of NullHandling.

pub fn from_i32(value: i32) -> Option<NullHandling>

👎Deprecated:

Use the TryFrom<i32> implementation instead

Converts an i32 to a NullHandling, or None if value is not a valid variant.

impl NullHandling

pub fn as_str_name(&self) -> &'static str

String value of the enum field names used in the ProtoBuf definition.

The values are not transformed in any way and thus are considered stable (if the ProtoBuf definition does not change) and safe for programmatic use.

pub fn from_str_name(value: &str) -> Option<Self>

Creates an enum from field names used in the ProtoBuf definition.

Trait Implementations

impl Clone for NullHandling

fn clone(&self) -> NullHandling

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for NullHandling

impl Debug for NullHandling

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

Formats the value using the given formatter.

impl Default for NullHandling

fn default() -> NullHandling

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for NullHandling

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for NullHandling

impl From<NullHandling> for i32

fn from(value: NullHandling) -> i32

Converts to this type from the input type.

impl Hash for NullHandling

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 Ord for NullHandling

fn cmp(&self, other: &NullHandling) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for NullHandling

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for NullHandling

fn partial_cmp(&self, other: &NullHandling) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for NullHandling

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for NullHandling

impl TryFrom<i32> for NullHandling

type Error = UnknownEnumValue

The type returned in the event of a conversion error.

fn try_from(value: i32) -> Result<NullHandling, UnknownEnumValue>

Performs the conversion.