Struct JoinInputCharacteristicsV2

pub struct JoinInputCharacteristicsV2 {
    pub unique_key: bool,
    pub not_cross: bool,
    pub arranged: bool,
    pub key_length: usize,
    pub cardinality: Option<Reverse<usize>>,
    pub filters: FilterCharacteristics,
    pub input: Reverse<usize>,
}

Newer version of JoinInputCharacteristics, with enable_join_prioritize_arranged turned on.

Fields

unique_key: bool

An excellent indication that record count will not increase.

not_cross: bool

Cross joins are bad. (key_length > 0 also implies that it is not a cross join. However, we need to note cross joins in a separate field, because not being a cross join is more important than arranged, but otherwise key_length is less important than arranged.)

arranged: bool

Indicates that there will be no additional in-memory footprint.

key_length: usize

A weaker signal that record count will not increase.

cardinality: Option<Reverse<usize>>

Estimated cardinality (lower is better)

filters: FilterCharacteristics

Characteristics of the filter that is applied at this input.

input: Reverse<usize>

We want to prefer input earlier in the input list, for stability of ordering.

Implementations

impl JoinInputCharacteristicsV2

pub fn new( unique_key: bool, key_length: usize, arranged: bool, cardinality: Option<usize>, filters: FilterCharacteristics, input: usize, ) -> Self

Creates a new instance with the given characteristics.

pub fn explain(&self) -> String

Turns the instance into a String to be printed in EXPLAIN.

Trait Implementations

impl Arbitrary for JoinInputCharacteristicsV2

type Parameters = (<bool as Arbitrary>::Parameters, <bool as Arbitrary>::Parameters, <bool as Arbitrary>::Parameters, <usize as Arbitrary>::Parameters, <Option<Reverse<usize>> as Arbitrary>::Parameters, <FilterCharacteristics as Arbitrary>::Parameters, <Reverse<usize> as Arbitrary>::Parameters)

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.

type Strategy = Map<(<bool as Arbitrary>::Strategy, <bool as Arbitrary>::Strategy, <bool as Arbitrary>::Strategy, <usize as Arbitrary>::Strategy, <Option<Reverse<usize>> as Arbitrary>::Strategy, <FilterCharacteristics as Arbitrary>::Strategy, <Reverse<usize> as Arbitrary>::Strategy), fn(_: (bool, bool, bool, usize, Option<Reverse<usize>>, FilterCharacteristics, Reverse<usize>)) -> JoinInputCharacteristicsV2>

The type of Strategy used to generate values of type Self.

fn arbitrary_with(_top: Self::Parameters) -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args.

fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self).

impl Clone for JoinInputCharacteristicsV2

fn clone(&self) -> JoinInputCharacteristicsV2

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for JoinInputCharacteristicsV2

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for JoinInputCharacteristicsV2

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for JoinInputCharacteristicsV2

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 MzReflect for JoinInputCharacteristicsV2

fn add_to_reflected_type_info(rti: &mut ReflectedTypeInfo)

Adds names and types of the fields of the struct or enum to rti.

impl Ord for JoinInputCharacteristicsV2

fn cmp(&self, other: &JoinInputCharacteristicsV2) -> 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 JoinInputCharacteristicsV2

fn eq(&self, other: &JoinInputCharacteristicsV2) -> 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 PartialOrd for JoinInputCharacteristicsV2

fn partial_cmp(&self, other: &JoinInputCharacteristicsV2) -> 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 JoinInputCharacteristicsV2

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for JoinInputCharacteristicsV2

impl StructuralPartialEq for JoinInputCharacteristicsV2