Enum NullOrder 

#[non_exhaustive]
pub enum NullOrder {
    Unspecified,
    NullsFirst,
    NullsLast,
    NotNull,
    UnknownValue(UnknownValue),
}

The null order of the key column. This dictates where NULL values sort in the sorted order. Note that columns which are NOT NULL can have a special encoding.

Working with unknown values

This enum is defined as #[non_exhaustive] because Google Cloud may add additional enum variants at any time. Adding new variants is not considered a breaking change. Applications should write their code in anticipation of:

• New values appearing in future releases of the client library, and
• New values received dynamically, without application changes.

Please consult the Working with enums section in the user guide for some guidelines.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Unspecified

Default value. This value is unused.

NullsFirst

NULL values sort before any non-NULL values.

NullsLast

NULL values sort after any non-NULL values.

NotNull

The column does not support NULL values.

UnknownValue(UnknownValue)

If set, the enum was initialized with an unknown value.

Applications can examine the value using NullOrder::value or NullOrder::name.

Implementations

impl NullOrder

pub fn value(&self) -> Option<i32>

Gets the enum value.

Returns None if the enum contains an unknown value deserialized from the string representation of enums.

pub fn name(&self) -> Option<&str>

Gets the enum value as a string.

Returns None if the enum contains an unknown value deserialized from the integer representation of enums.

Trait Implementations

impl Clone for NullOrder

fn clone(&self) -> NullOrder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NullOrder

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

Formats the value using the given formatter.

impl Default for NullOrder

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for NullOrder

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

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for NullOrder

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

Formats the value using the given formatter.

impl From<&str> for NullOrder

fn from(value: &str) -> Self

Converts to this type from the input type.

impl From<i32> for NullOrder

fn from(value: i32) -> Self

Converts to this type from the input type.

impl PartialEq for NullOrder

fn eq(&self, other: &NullOrder) -> 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 Serialize for NullOrder

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 NullOrder