Enum PartitionSpec 

pub enum PartitionSpec {
    Hash {
        columns: Vec<String>,
        buckets: u32,
    },
    Range {
        columns: Vec<String>,
    },
    Tenant {
        column: String,
        buckets_per_tenant: u32,
    },
    TimeRange {
        column: String,
    },
    Unpartitioned,
}

How one table’s rows map onto tablets — the planner’s dependency-free mirror of mongreldb_cluster::tablet::Partitioning (spec section 12.2). The cluster wave adapts the cluster type onto this enum one-to-one.

Variants

Hash

Hash of the declared columns into a fixed bucket space.

Fields

columns: Vec<String>

buckets: u32

Range

Lexicographic ranges over the declared columns.

Fields

columns: Vec<String>

Tenant

One bucket space per tenant.

Fields

column: String

buckets_per_tenant: u32

TimeRange

Time-bucketed ranges over the timestamp column.

Fields

column: String

Unpartitioned

Single-tablet (unpartitioned) table.

Implementations

impl PartitionSpec

pub fn partition_columns(&self) -> Vec<&str>

The declared partition-key columns, in key order.

pub fn colocated_with(&self, other: &PartitionSpec) -> bool

True when two tables partition identically, so equal partition keys land on the same tablet and a join on the partition key can be planned colocated (spec section 12.10: “colocated join”). Two unpartitioned tables are trivially colocated (both live on their single tablet).

Trait Implementations

impl Clone for PartitionSpec

fn clone(&self) -> PartitionSpec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PartitionSpec

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PartitionSpec

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for PartitionSpec

impl PartialEq for PartitionSpec

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for PartitionSpec

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 PartitionSpec