Enum aws_sdk_glue::types::AggFunction
source · #[non_exhaustive]pub enum AggFunction {
Show 16 variants
Avg,
Count,
CountDistinct,
First,
Kurtosis,
Last,
Max,
Min,
Skewness,
StddevPop,
StddevSamp,
Sum,
SumDistinct,
VarPop,
VarSamp,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against AggFunction
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let aggfunction = unimplemented!();
match aggfunction {
AggFunction::Avg => { /* ... */ },
AggFunction::Count => { /* ... */ },
AggFunction::CountDistinct => { /* ... */ },
AggFunction::First => { /* ... */ },
AggFunction::Kurtosis => { /* ... */ },
AggFunction::Last => { /* ... */ },
AggFunction::Max => { /* ... */ },
AggFunction::Min => { /* ... */ },
AggFunction::Skewness => { /* ... */ },
AggFunction::StddevPop => { /* ... */ },
AggFunction::StddevSamp => { /* ... */ },
AggFunction::Sum => { /* ... */ },
AggFunction::SumDistinct => { /* ... */ },
AggFunction::VarPop => { /* ... */ },
AggFunction::VarSamp => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when aggfunction
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant AggFunction::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
AggFunction::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant AggFunction::NewFeature
is defined.
Specifically, when aggfunction
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on AggFunction::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Avg
Count
CountDistinct
First
Kurtosis
Last
Max
Min
Skewness
StddevPop
StddevSamp
Sum
SumDistinct
VarPop
VarSamp
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl AggFunction
impl AggFunction
source§impl AggFunction
impl AggFunction
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for AggFunction
impl AsRef<str> for AggFunction
source§impl Clone for AggFunction
impl Clone for AggFunction
source§fn clone(&self) -> AggFunction
fn clone(&self) -> AggFunction
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for AggFunction
impl Debug for AggFunction
source§impl Display for AggFunction
impl Display for AggFunction
source§impl From<&str> for AggFunction
impl From<&str> for AggFunction
source§impl FromStr for AggFunction
impl FromStr for AggFunction
source§impl Hash for AggFunction
impl Hash for AggFunction
source§impl Ord for AggFunction
impl Ord for AggFunction
source§fn cmp(&self, other: &AggFunction) -> Ordering
fn cmp(&self, other: &AggFunction) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for AggFunction
impl PartialEq for AggFunction
source§fn eq(&self, other: &AggFunction) -> bool
fn eq(&self, other: &AggFunction) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for AggFunction
impl PartialOrd for AggFunction
source§fn partial_cmp(&self, other: &AggFunction) -> Option<Ordering>
fn partial_cmp(&self, other: &AggFunction) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for AggFunction
impl StructuralPartialEq for AggFunction
Auto Trait Implementations§
impl Freeze for AggFunction
impl RefUnwindSafe for AggFunction
impl Send for AggFunction
impl Sync for AggFunction
impl Unpin for AggFunction
impl UnwindSafe for AggFunction
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.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> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more