pub type Col2KeyBatcher<K, T, R> = Col2ValBatcher<K, (), T, R>;Aliased Type§
struct Col2KeyBatcher<K, T, R> { /* private fields */ }pub type Col2KeyBatcher<K, T, R> = Col2ValBatcher<K, (), T, R>;struct Col2KeyBatcher<K, T, R> { /* private fields */ }