Trait MergeOperator 

pub trait MergeOperator: Send + Sync {
    // Required method
    fn merge_batch(
        &self,
        key: &Bytes,
        existing_value: Option<Bytes>,
        operands: &[Bytes],
    ) -> Bytes;
}

Trait for merging existing values with new values.

Merge operators must be associative: merge_batch(merge_batch(a, [b]), [c]) == merge_batch(a, merge_batch(b, [c])). This ensures consistent merging behavior regardless of the order of operations.

Required Methods

fn merge_batch( &self, key: &Bytes, existing_value: Option<Bytes>, operands: &[Bytes], ) -> Bytes

Merges a batch of operands with an optional existing value.

Arguments

• key - The key associated with the values being merged
• existing_value - The current value stored in the database (if any)
• operands - A slice of operands to merge, ordered from oldest to newest

Implementors