Enum Delta 

pub enum Delta {
    Set {
        key: EncodedKey,
        values: EncodedValues,
    },
    Unset {
        key: EncodedKey,
        values: EncodedValues,
    },
    Remove {
        key: EncodedKey,
    },
    Drop {
        key: EncodedKey,
        up_to_version: Option<CommitVersion>,
        keep_last_versions: Option<usize>,
    },
}

Variants

Set

Fields

key: EncodedKey

values: EncodedValues

Unset

Unset an entry, preserving the deleted values. Symmetric with Set - use when the deleted data matters (e.g., row data, CDC).

Fields

key: EncodedKey

values: EncodedValues

Remove

Remove an entry without preserving the deleted values. Use when only the key matters (e.g., index entries, catalog metadata).

Fields

key: EncodedKey

Drop

Drop operation - completely erases versioned entries from storage. Unlike Remove (which writes a tombstone and generates CDC), Drop:

• Deletes existing entries without writing anything new
• Never generates CDC events

Fields

key: EncodedKey

up_to_version: Option<CommitVersion>

If Some(v), drop all versions where version < v (keeps v and later). If None, this constraint is not applied.

keep_last_versions: Option<usize>

If Some(n), keep the n most recent versions, drop older ones. If None, this constraint is not applied. Can be combined with up_to_version (both constraints apply). If both are None, drops ALL versions.

Implementations

impl Delta

pub fn key(&self) -> &EncodedKey

Returns the key

pub fn values(&self) -> Option<&EncodedValues>

Returns the encoded values, if None, it means the entry is marked as remove or drop.

Trait Implementations

impl Clone for Delta

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Delta

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

Formats the value using the given formatter.

impl Ord for Delta

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Delta

fn eq(&self, other: &Delta) -> 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 PartialOrd for Delta

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for Delta

impl StructuralPartialEq for Delta