Type Alias Batcher 

pub type Batcher<K, V, T, R> = ChunkBatcher<Chunker<(K, V, T, R)>, ColChunk<(K, V, T, R)>>;

The columnar merge batcher (the chunk harness’s MergeBatcher over ColChunk).

Aliased Type

pub struct Batcher<K, V, T, R> { /* private fields */ }