Enum PreferCount 

pub enum PreferCount {
    Exact,
    Planned,
    Estimated,
}

How to count results.

Variants

Exact

Exact count (slower)

Planned

Query planner estimate

Estimated

Use planner if count exceeds max-rows, otherwise exact

Trait Implementations

impl Clone for PreferCount

fn clone(&self) -> PreferCount

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PreferCount

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PreferCount

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for PreferCount

fn eq(&self, other: &PreferCount) -> 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 PreferCount

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for PreferCount

impl Eq for PreferCount

impl StructuralPartialEq for PreferCount