Struct TopNRel 

pub struct TopNRel {
    pub common: Option<RelCommon>,
    pub input: Option<Box<Rel>>,
    pub sorts: Vec<SortField>,
    pub offset: Option<Box<Expression>>,
    pub count: Option<Box<Expression>>,
    pub mode: i32,
    pub advanced_extension: Option<AdvancedExtension>,
}

The top-N relational operator. A combination of a sort and fetch that only maintains the number of records required to ensure a limited output.

Fields

common: Option<RelCommon>

input: Option<Box<Rel>>

sorts: Vec<SortField>

List of one or more fields to sort by. At least one is required.

offset: Option<Box<Expression>>

Expression evaluating to a non-negative integer specifying the number of records to skip. Null is treated as 0. Recommended type is int64.

count: Option<Box<Expression>>

Expression evaluating to a non-negative integer specifying the number of records to return. Null signals ALL. Recommended type is int64.

mode: i32

Determines how to handle rows tied with the last returned row.

advanced_extension: Option<AdvancedExtension>

Implementations

impl TopNRel

pub fn mode(&self) -> FetchMode

Returns the enum value of mode, or the default if the field is set to an invalid enum value.

pub fn set_mode(&mut self, value: FetchMode)

Sets mode to the provided enum value.

Trait Implementations

impl Clone for TopNRel

fn clone(&self) -> TopNRel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TopNRel

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

Formats the value using the given formatter.

impl Default for TopNRel

fn default() -> Self

Returns the “default value” for a type.

impl Message for TopNRel

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 TopNRel

const NAME: &'static str = "TopNRel"

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 = "substrait"

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 TopNRel

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TopNRel