Struct AggregateExpr 

pub struct AggregateExpr {
    pub function: AggFunction,
    pub source_column: String,
    pub output_column: String,
}

An aggregate expression: function + source column → result column.

Fields

function: AggFunction

Aggregate function.

source_column: String

Source column name (e.g., “cpu”). “*” for COUNT.

output_column: String

Output column name (e.g., “cpu_avg”). Auto-generated if empty.

Trait Implementations

impl Clone for AggregateExpr

fn clone(&self) -> AggregateExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggregateExpr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AggregateExpr

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'__msgpack_de> FromMessagePack<'__msgpack_de> for AggregateExpr

fn read<R: Read<'__msgpack_de>>(reader: &mut R) -> Result<Self, Error>

where Self: Sized,

Reads the MessagePack representation of this value from the provided reader.

impl Serialize for AggregateExpr

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ToMessagePack for AggregateExpr

fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error>

Writes the MessagePack representation of this value into the provided writer.