[−][src]Enum arrow::ipc::gen::Schema::MapOffset
A Map is a logical nested type that is represented as
List<entry: Struct<key: K, value: V>>
In this layout, the keys and values are each respectively contiguous. We do not constrain the key and value types, so the application is responsible for ensuring that the keys are hashable and unique. Whether the keys are sorted may be set in the metadata for this field
In a Field with Map type, the Field has a child Struct field, which then has two children: key type and the second the value type. The names of the child fields may be respectively "entry", "key", and "value", but this is not enforced
Map
child[0]
entry: Structchild[0]
key: Kchild[1]
value: V
Neither the "entry" field nor the "key" field may be nullable.
The metadata is structured so that Arrow systems without special handling for Map can make Map an alias for List. The "layout" attribute for the Map field must have the same contents as a List.
Auto Trait Implementations
impl Unpin for MapOffset
impl Sync for MapOffset
impl Send for MapOffset
impl UnwindSafe for MapOffset
impl RefUnwindSafe for MapOffset
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> FromCast<T> for T
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impl<T, U> Cast<U> for T where
U: FromCast<T>,
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U: FromCast<T>,