[−][src]Struct arrow::datatypes::Schema
Describes the meta-data of an ordered sequence of relative types.
Note that this information is only part of the meta-data and not part of the physical memory layout.
Methods
impl Schema
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impl Schema
pub fn empty() -> Self
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pub fn empty() -> Self
Creates an empty Schema
pub fn new(fields: Vec<Field>) -> Self
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pub fn new(fields: Vec<Field>) -> Self
Creates a new Schema
from a sequence of Field
values
Example
let field_a = Field::new("a", DataType::Int64, false); let field_b = Field::new("b", DataType::Boolean, false); let schema = Schema::new(vec![field_a, field_b]);
pub fn fields(&self) -> &Vec<Field>
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pub fn fields(&self) -> &Vec<Field>
Returns an immutable reference of the vector of Field
instances
pub fn field(&self, i: usize) -> &Field
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pub fn field(&self, i: usize) -> &Field
Returns an immutable reference of a specific Field
instance selected using an offset
within the internal fields
vector
pub fn column_with_name(&self, name: &str) -> Option<(usize, &Field)>
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pub fn column_with_name(&self, name: &str) -> Option<(usize, &Field)>
Look up a column by name and return a immutable reference to the column along with it's index
Trait Implementations
impl Clone for Schema
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impl Clone for Schema
fn clone(&self) -> Schema
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fn clone(&self) -> Schema
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Display for Schema
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impl Display for Schema
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl Debug for Schema
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impl Debug for Schema
Auto Trait Implementations
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
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impl<T> ToOwned for T where
T: Clone,
type Owned = T
fn to_owned(&self) -> T
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fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
fn clone_into(&self, target: &mut T)
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fn clone_into(&self, target: &mut T)
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
impl<T> From for T
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impl<T> From for T
impl<T> ToString for T where
T: Display + ?Sized,
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impl<T> ToString for T where
T: Display + ?Sized,
impl<T, U> Into for T where
U: From<T>,
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impl<T, U> Into for T where
U: From<T>,
impl<T, U> TryFrom for T where
T: From<U>,
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impl<T, U> TryFrom for T where
T: From<U>,
type Error = !
try_from
)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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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
try_from
)Performs the conversion.
impl<T> Borrow for T where
T: ?Sized,
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impl<T> Borrow for T where
T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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impl<T> Any for T where
T: 'static + ?Sized,
fn get_type_id(&self) -> TypeId
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fn get_type_id(&self) -> TypeId
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Gets the TypeId
of self
. Read more
impl<T> BorrowMut for T where
T: ?Sized,
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impl<T> BorrowMut for T where
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<T, U> TryInto for T where
U: TryFrom<T>,
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impl<T, U> TryInto for T where
U: TryFrom<T>,