#[non_exhaustive]pub enum ColumnStatisticsType {
Binary,
Boolean,
Date,
Decimal,
Double,
Long,
String,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against ColumnStatisticsType
, 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 columnstatisticstype = unimplemented!();
match columnstatisticstype {
ColumnStatisticsType::Binary => { /* ... */ },
ColumnStatisticsType::Boolean => { /* ... */ },
ColumnStatisticsType::Date => { /* ... */ },
ColumnStatisticsType::Decimal => { /* ... */ },
ColumnStatisticsType::Double => { /* ... */ },
ColumnStatisticsType::Long => { /* ... */ },
ColumnStatisticsType::String => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when columnstatisticstype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant ColumnStatisticsType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
ColumnStatisticsType::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 ColumnStatisticsType::NewFeature
is defined.
Specifically, when columnstatisticstype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on ColumnStatisticsType::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
Binary
Boolean
Date
Decimal
Double
Long
String
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 ColumnStatisticsType
impl ColumnStatisticsType
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 ColumnStatisticsType
impl AsRef<str> for ColumnStatisticsType
Source§impl Clone for ColumnStatisticsType
impl Clone for ColumnStatisticsType
Source§fn clone(&self) -> ColumnStatisticsType
fn clone(&self) -> ColumnStatisticsType
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moreSource§impl Debug for ColumnStatisticsType
impl Debug for ColumnStatisticsType
Source§impl Display for ColumnStatisticsType
impl Display for ColumnStatisticsType
Source§impl From<&str> for ColumnStatisticsType
impl From<&str> for ColumnStatisticsType
Source§impl FromStr for ColumnStatisticsType
impl FromStr for ColumnStatisticsType
Source§impl Hash for ColumnStatisticsType
impl Hash for ColumnStatisticsType
Source§impl Ord for ColumnStatisticsType
impl Ord for ColumnStatisticsType
Source§fn cmp(&self, other: &ColumnStatisticsType) -> Ordering
fn cmp(&self, other: &ColumnStatisticsType) -> 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 ColumnStatisticsType
impl PartialEq for ColumnStatisticsType
Source§impl PartialOrd for ColumnStatisticsType
impl PartialOrd for ColumnStatisticsType
impl Eq for ColumnStatisticsType
impl StructuralPartialEq for ColumnStatisticsType
Auto Trait Implementations§
impl Freeze for ColumnStatisticsType
impl RefUnwindSafe for ColumnStatisticsType
impl Send for ColumnStatisticsType
impl Sync for ColumnStatisticsType
impl Unpin for ColumnStatisticsType
impl UnwindSafe for ColumnStatisticsType
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