Struct WindowStateSnapshot 

pub struct WindowStateSnapshot {
    pub last_output_key: Option<StateKey>,
    pub function_state: Option<FunctionState>,
}

Persisted snapshot of a window function state, stored per partition per window call in the intermediate_state_table.

Fields

last_output_key: Option<StateKey>

The key of the last row that was output before this snapshot was taken. Absent when no row has been output yet.

function_state: Option<FunctionState>

Function-specific state. The variant must match the window function type of the corresponding call; a mismatch is treated as a decode error.

Implementations

impl WindowStateSnapshot

pub fn get_last_output_key(&self) -> Result<&StateKey, PbFieldNotFound>

pub fn get_function_state(&self) -> Result<&FunctionState, PbFieldNotFound>

Trait Implementations

impl Clone for WindowStateSnapshot

fn clone(&self) -> WindowStateSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WindowStateSnapshot

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

Formats the value using the given formatter.

impl Default for WindowStateSnapshot

fn default() -> Self

Returns the “default value” for a type.

impl Hash for WindowStateSnapshot

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Message for WindowStateSnapshot

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 WindowStateSnapshot

fn eq(&self, other: &WindowStateSnapshot) -> 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 Eq for WindowStateSnapshot

impl StructuralPartialEq for WindowStateSnapshot