Struct google_api_proto::google::datastore::v1::aggregation_query::Aggregation

pub struct Aggregation {
    pub alias: String,
    pub operator: Option<Operator>,
}

Defines an aggregation that produces a single result.

Fields

alias: String

Optional. Optional name of the property to store the result of the aggregation.

If not provided, Datastore will pick a default name following the format property_<incremental_id++>. For example:

AGGREGATE
   COUNT_UP_TO(1) AS count_up_to_1,
   COUNT_UP_TO(2),
   COUNT_UP_TO(3) AS count_up_to_3,
   COUNT(*)
OVER (
   ...
);

becomes:

AGGREGATE
   COUNT_UP_TO(1) AS count_up_to_1,
   COUNT_UP_TO(2) AS property_1,
   COUNT_UP_TO(3) AS count_up_to_3,
   COUNT(*) AS property_2
OVER (
   ...
);

Requires:

• Must be unique across all aggregation aliases.
• Conform to [entity property name][google.datastore.v1.Entity.properties] limitations.

operator: Option<Operator>

The type of aggregation to perform, required.

Trait Implementations

impl Clone for Aggregation

fn clone(&self) -> Aggregation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Aggregation

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

Formats the value using the given formatter.

impl Default for Aggregation

fn default() -> Self

Returns the “default value” for a type.

impl Message for Aggregation

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for Aggregation

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Aggregation