Struct arrow::datatypes::UnionFields

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pub struct UnionFields(/* private fields */);
Expand description

A cheaply cloneable, owned collection of FieldRef and their corresponding type ids

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impl UnionFields

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pub fn empty() -> UnionFields

Create a new UnionFields with no fields

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pub fn new<F, T>(type_ids: T, fields: F) -> UnionFields
where F: IntoIterator, <F as IntoIterator>::Item: Into<Arc<Field>>, T: IntoIterator<Item = i8>,

Create a new UnionFields from a Fields and array of type_ids

See https://arrow.apache.org/docs/format/Columnar.html#union-layout

use arrow_schema::{DataType, Field, UnionFields};
// Create a new UnionFields with type id mapping
// 1 -> DataType::UInt8
// 3 -> DataType::Utf8
UnionFields::new(
    vec![1, 3],
    vec![
        Field::new("field1", DataType::UInt8, false),
        Field::new("field3", DataType::Utf8, false),
    ],
);
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pub fn size(&self) -> usize

Return size of this instance in bytes.

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pub fn len(&self) -> usize

Returns the number of fields in this UnionFields

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pub fn is_empty(&self) -> bool

Returns true if this is empty

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pub fn iter(&self) -> impl Iterator<Item = (i8, &Arc<Field>)>

Returns an iterator over the fields and type ids in this UnionFields

Note: the iteration order is not guaranteed

Trait Implementations§

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impl Clone for UnionFields

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fn clone(&self) -> UnionFields

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for UnionFields

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl FromIterator<(i8, Arc<Field>)> for UnionFields

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fn from_iter<T>(iter: T) -> UnionFields
where T: IntoIterator<Item = (i8, Arc<Field>)>,

Creates a value from an iterator. Read more
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impl Hash for UnionFields

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fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for UnionFields

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fn cmp(&self, other: &UnionFields) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for UnionFields

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fn eq(&self, other: &UnionFields) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for UnionFields

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fn partial_cmp(&self, other: &UnionFields) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for UnionFields

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impl StructuralPartialEq for UnionFields

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,