Struct dataflow::render::reduce::Accum [−][src]
struct Accum {
inner: AccumInner,
total: isize,
}
Expand description
Wraps an AccumInner
with tracking of the total number of records observed,
i.e., including null records.
It is important that Accum.is_zero()
returns false
if at least one null
record has been observed. Differential dataflow will suppress output when
Accum.is_zero()
returns true
, but SQL requires that we produce an
explicit zero or null record as long as there is some input record.
Fields
inner: AccumInner
total: isize
Trait Implementations
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
Auto Trait Implementations
impl RefUnwindSafe for Accum
impl UnwindSafe for Accum
Blanket Implementations
Mutably borrows from an owned value. Read more
Compare self to key
and return true
if they are equal.
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more