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parallel_count

reddb::storage::query::executors::parallel_scan

Function parallel_count 

Source 
pub fn parallel_count<T, F>(input: &[T], chunk_count: usize, counter: F) -> u64
where
    T: Send + Sync + Clone + 'static,
    F: Fn(&[T]) -> u64 + Send + Sync + 'static,
Expand description

Count-only variant of parallel_scan that avoids materialising the intermediate Vec. The worker returns a usize (number of matching rows in its chunk), and the coordinator sums them.

Used by SELECT COUNT(*) FROM t WHERE filter where the full row payload is irrelevant.