Enum mz_expr::AccessStrategy

pub enum AccessStrategy {
    UnknownOrLocal,
    Persist,
    Index(Vec<(GlobalId, IndexUsageType)>),
    SameDataflow,
}

For a global Get, this indicates whether we are going to read from Persist or from an index. (See comment in MirRelationExpr::Get.)

Variants

UnknownOrLocal

It’s either a local Get (a CTE), or unknown at the time. prune_and_annotate_dataflow_index_imports decides it for global Gets, and thus switches to one of the other variants.

Persist

The Get will read from Persist.

Index(Vec<(GlobalId, IndexUsageType)>)

The Get will read from an index or indexes: (index id, how the index will be used).

SameDataflow

The Get will read a collection that is computed by the same dataflow, but in a different BuildDesc in objects_to_build.

Trait Implementations

impl Arbitrary for AccessStrategy

type Parameters = <Vec<(GlobalId, IndexUsageType)> as Arbitrary>::Parameters

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

type Strategy = Union<BoxedStrategy<AccessStrategy>>

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 AccessStrategy

fn clone(&self) -> AccessStrategy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for AccessStrategy

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AccessStrategy

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for AccessStrategy

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 AccessStrategy

fn cmp(&self, other: &AccessStrategy) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for AccessStrategy

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

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

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 AccessStrategy

impl StructuralPartialEq for AccessStrategy