Struct ShardField 

pub struct ShardField {
    pub field_id: String,
    pub source_ids: Vec<i32>,
    pub transform: Option<String>,
    pub expression: Option<String>,
    pub result_type: String,
    pub parameters: HashMap<String, String>,
}

Shard field definition.

Fields

field_id: String

Unique string identifier for this shard field.

source_ids: Vec<i32>

Field IDs referencing source columns in the schema.

transform: Option<String>

Well-known shard transform name (e.g., “identity”, “year”, “bucket”). Mutually exclusive with expression.

expression: Option<String>

DataFusion SQL expression for custom logic. Mutually exclusive with transform.

result_type: String

Output type of the shard value (Arrow type name).

parameters: HashMap<String, String>

Transform parameters (e.g., num_buckets for bucket transform).

Implementations

impl ShardField

pub fn transform(&self) -> &str

Returns the value of transform, or the default value if transform is unset.

pub fn expression(&self) -> &str

Returns the value of expression, or the default value if expression is unset.

Trait Implementations

impl Clone for ShardField

fn clone(&self) -> ShardField

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ShardField

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

Formats the value using the given formatter.

impl Default for ShardField

fn default() -> Self

Returns the “default value” for a type.

impl Message for ShardField

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 Name for ShardField

const NAME: &'static str = "ShardField"

Simple name for this Message. This name is the same as it appears in the source .proto file, e.g. FooBar.

const PACKAGE: &'static str = "lance.table"

Package name this message type is contained in. They are domain-like and delimited by ., e.g. google.protobuf.

fn full_name() -> String

Fully-qualified unique name for this Message. It’s prefixed with the package name and names of any parent messages, e.g. google.rpc.BadRequest.FieldViolation. By default, this is the package name followed by the message name. Fully-qualified names must be unique within a domain of Type URLs.

fn type_url() -> String

Type URL for this Message, which by default is the full name with a leading slash, but may also include a leading domain name, e.g. type.googleapis.com/google.profile.Person. This can be used when serializing into the google.protobuf.Any type.

impl PartialEq for ShardField

fn eq(&self, other: &ShardField) -> 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 StructuralPartialEq for ShardField