pub struct UnionFields(/* private fields */);
Expand description
A cheaply cloneable, owned collection of FieldRef
and their corresponding type ids
Implementations§
Source§impl UnionFields
impl UnionFields
Sourcepub fn empty() -> Self
pub fn empty() -> Self
Create a new UnionFields
with no fields
Sourcepub fn new<F, T>(type_ids: T, fields: F) -> Self
pub fn new<F, T>(type_ids: T, fields: F) -> Self
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),
],
);
Sourcepub fn len(&self) -> usize
pub fn len(&self) -> usize
Returns the number of fields in this UnionFields
Trait Implementations§
Source§impl Clone for UnionFields
impl Clone for UnionFields
Source§fn clone(&self) -> UnionFields
fn clone(&self) -> UnionFields
Returns a copy of the value. Read more
1.0.0 · Source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moreSource§impl Debug for UnionFields
impl Debug for UnionFields
Source§impl FromIterator<(i8, Arc<Field>)> for UnionFields
impl FromIterator<(i8, Arc<Field>)> for UnionFields
Source§impl Hash for UnionFields
impl Hash for UnionFields
Source§impl Ord for UnionFields
impl Ord for UnionFields
Source§fn cmp(&self, other: &UnionFields) -> Ordering
fn cmp(&self, other: &UnionFields) -> Ordering
1.21.0 · Source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
Compares and returns the maximum of two values. Read more
Source§impl PartialEq for UnionFields
impl PartialEq for UnionFields
Source§impl PartialOrd for UnionFields
impl PartialOrd for UnionFields
impl Eq for UnionFields
impl StructuralPartialEq for UnionFields
Auto Trait Implementations§
impl Freeze for UnionFields
impl RefUnwindSafe for UnionFields
impl Send for UnionFields
impl Sync for UnionFields
impl Unpin for UnionFields
impl UnwindSafe for UnionFields
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
Mutably borrows from an owned value. Read more