Struct mz_compute::render::reduce::Accum
source · struct Accum {
inner: AccumInner,
total: Diff,
}
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: Diff
Trait Implementations§
source§impl<'de> Deserialize<'de> for Accum
impl<'de> Deserialize<'de> for Accum
source§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
source§impl Ord for Accum
impl Ord for Accum
source§impl PartialEq<Accum> for Accum
impl PartialEq<Accum> for Accum
source§impl PartialOrd<Accum> for Accum
impl PartialOrd<Accum> for Accum
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
This method tests less than or equal to (for
self
and other
) and is used by the <=
operator. Read moreimpl Eq for Accum
impl StructuralEq for Accum
impl StructuralPartialEq for Accum
Auto Trait Implementations§
impl RefUnwindSafe for Accum
impl Send for Accum
impl Sync for Accum
impl Unpin for Accum
impl UnwindSafe for Accum
Blanket Implementations§
source§impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.source§impl<T> FutureExt for T
impl<T> FutureExt for T
source§fn with_context(self, otel_cx: Context) -> WithContext<Self>
fn with_context(self, otel_cx: Context) -> WithContext<Self>
source§fn with_current_context(self) -> WithContext<Self>
fn with_current_context(self) -> WithContext<Self>
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
source§fn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
Wrap the input message
T
in a tonic::Request
source§impl<T> Pointable for T
impl<T> Pointable for T
source§impl<P, R> ProtoType<R> for Pwhere
R: RustType<P>,
impl<P, R> ProtoType<R> for Pwhere
R: RustType<P>,
source§fn into_rust(self) -> Result<R, TryFromProtoError>
fn into_rust(self) -> Result<R, TryFromProtoError>
See
RustType::from_proto
.source§fn from_rust(rust: &R) -> P
fn from_rust(rust: &R) -> P
See
RustType::into_proto
.