Enum WriteTimeTtlFunction 

pub enum WriteTimeTtlFunction {
    WriteTime,
    Ttl,
}

The two metadata-retrieval functions Cassandra exposes in SELECT.

These are first-class variants rather than being folded into FunctionCall so the executor can dispatch on them without string-matching function names.

Executor TODO (#692)

Evaluation is not yet wired: the executor must thread writetime / ttl cell-level metadata from SSTableReader up through the row-scanning loop and then return Value::BigInt(micros) / Value::Int(seconds) respectively. Until that work lands, selecting these columns returns Value::Null.

Variants

WriteTime

WRITETIME(col) — returns the write timestamp in microseconds (bigint)

Ttl

TTL(col) — returns the remaining TTL in seconds (int), or NULL if no TTL

Trait Implementations

impl Clone for WriteTimeTtlFunction

fn clone(&self) -> WriteTimeTtlFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WriteTimeTtlFunction

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WriteTimeTtlFunction

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for WriteTimeTtlFunction

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

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 WriteTimeTtlFunction