Struct PartitionKeyShape 

pub struct PartitionKeyShape {
    pub partition_key_count: usize,
    pub clustering_key_count: usize,
    pub non_key_column_names: HashSet<String>,
    pub single_pk_component: Option<PartitionKeyComponent>,
}

The AUTHORITATIVE partition-key shape of a table, derived schema-less from the SSTable Statistics.db SerializationHeader (issue #1750).

Carries ONLY facts Cassandra actually serialises: how many partition-key components and clustering keys the table has, and the REAL names of the non-key (regular + static) columns. The partition-/clustering-key column NAMES are deliberately absent — Cassandra never serialises them, so any pk-name a schema-less parser reports is a synthesised placeholder that must not drive routing decisions (no-heuristics mandate #28).

Fields

partition_key_count: usize

Number of partition-key components (a single-component pk is 1).

clustering_key_count: usize

Number of clustering-key columns.

non_key_column_names: HashSet<String>

The real names of the non-key (regular + static) columns.

single_pk_component: Option<PartitionKeyComponent>

For a single-component pk ONLY: the sole partition-key column’s authoritative CQL type (from the SerializationHeader keyType) and its header-carried name.

The CQL type is authoritative — Cassandra serialises partition-key TYPES even though it never serialises their NAMES (issue #1750, roborev 3784). It drives the TYPED single-component key encoding so a schema-less WHERE int_pk = 42 builds the 4-byte int key Cassandra wrote, not an 8-byte BigInt key. The name is the header’s synthesised placeholder (id for uuid/timeuuid, else partition_key) — NOT a trusted identity, only the label under which build_row_from_scan reconstructs the pk column so the seeked row can be re-validated against the predicate. None for a composite pk (the typed single-component fast path does not apply) or when no reader exposed a single-component pk type.

Trait Implementations

impl Clone for PartitionKeyShape

fn clone(&self) -> PartitionKeyShape

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PartitionKeyShape

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

Formats the value using the given formatter.

impl Eq for PartitionKeyShape

impl PartialEq for PartitionKeyShape

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PartitionKeyShape