Struct polars::prelude::Schema

source · [−]

pub struct Schema { /* private fields */ }

Implementations

source

impl Schema

source

pub fn try_from_fallible(flds: I) -> Result<Schema, PolarsError> where
I: IntoIterator<Item = Result<Field, PolarsError>>,

source

pub fn insert_index(
 &self,
 index: usize,
 name: String,
 dtype: DataType
) -> Option<Schema>

source

pub fn get(&self, name: &str) -> Option<&DataType>

source

pub fn get_full(&self, name: &str) -> Option<(usize, &String, &DataType )>

source

pub fn get_field(&self, name: &str) -> Option<Field>

source

pub fn get_index(&self, index: usize) -> Option<(&String, &DataType )>

source

pub fn coerce_by_name(&mut self, name: &str, dtype: DataType) -> Option<()>

source

pub fn coerce_by_index(&mut self, index: usize, dtype: DataType) -> Option<()>

source

pub fn with_column(&mut self, name: String, dtype: DataType)

source

pub fn merge(&mut self, other: Schema)

source

pub fn to_arrow(&self) -> Schema

source

pub fn iter_fields(&self) -> impl Iterator<Item = Field>

source

pub fn iter_dtypes(&self) -> impl Iterator<Item = &DataType>

source

pub fn iter_names(&self) -> impl Iterator<Item = &String> + ExactSizeIterator

source

pub fn iter(&self) -> impl Iterator<Item = (&String, &DataType )>

Trait Implementations

source

impl Clone for Schema

source

fn clone(&self) -> Schema

Returns a copy of the value. Read more

1.0.0 · source

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

source

impl Debug for Schema

source

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

Formats the value using the given formatter. Read more

source

impl Default for Schema

source

fn default() -> Schema

Returns the “default value” for a type. Read more

source

impl<'_, '_> From<&'_ Row<'_>> for Schema

source

fn from(row: &Row<'_>) -> Schema

Performs the conversion.

source

impl<I, J> From for Schema where
I: IntoIterator<Item = J>,
J: Into<Field>,

source

fn from(flds: I) -> Schema

Performs the conversion.

source

impl IndexOfSchema for Schema

source

fn index_of(&self, name: &str) -> Option<usize>

Get the index of column by name.

source

fn try_index_of(&self, name: &str) -> Result<usize, PolarsError>

source

impl PartialEq<Schema> for Schema

source

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

This method tests for self and other values to be equal, and is used by ==. Read more

source

fn ne(&self, other: &Schema) -> bool

This method tests for !=.

source

impl Eq for Schema

source

impl StructuralEq for Schema

source

impl StructuralPartialEq for Schema

Auto Trait Implementations

impl RefUnwindSafe for Schema

impl Send for Schema

impl Sync for Schema

impl Unpin for Schema

impl UnwindSafe for Schema

Blanket Implementations

source

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

source

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

source

impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

source

impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

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

Mutably borrows from an owned value. Read more

source

impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

source

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

Compare self to key and return true if they are equal.

source

impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

source

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

const: unstable · source

fn into(self) -> U

Calls U::from(self).

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

source

impl<T> Pointable for T

source

const ALIGN: usize

The alignment of pointer.

type Init = T

The type for initializers.

source

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more

source

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more

source

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more

source

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more

source

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

type Owned = T

The resulting type after obtaining ownership.

source

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

source

fn clone_into(&self, target: &mut T)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

source

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

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

source

impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

source

impl<V, T> VZip<V> for T where
V: MultiLane<T>,

source

Struct polars::prelude::Schema

Implementations

impl Schema

pub fn try_from_fallible<I>(flds: I) -> Result<Schema, PolarsError> where I: IntoIterator<Item = Result<Field, PolarsError>>,

pub fn new() -> Schema

pub fn with_capacity(capacity: usize) -> Schema

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn rename(&mut self, old: &str, new: String) -> Option<()>

pub fn insert_index( &self, index: usize, name: String, dtype: DataType) -> Option<Schema>

pub fn get(&self, name: &str) -> Option<&DataType>

pub fn get_full(&self, name: &str) -> Option<(usize, &String, &DataType)>

pub fn get_field(&self, name: &str) -> Option<Field>

pub fn get_index(&self, index: usize) -> Option<(&String, &DataType)>

pub fn coerce_by_name(&mut self, name: &str, dtype: DataType) -> Option<()>

pub fn coerce_by_index(&mut self, index: usize, dtype: DataType) -> Option<()>

pub fn with_column(&mut self, name: String, dtype: DataType)

pub fn merge(&mut self, other: Schema)

pub fn to_arrow(&self) -> Schema

pub fn iter_fields(&self) -> impl Iterator<Item = Field>

pub fn iter_dtypes(&self) -> impl Iterator<Item = &DataType>

pub fn iter_names(&self) -> impl Iterator<Item = &String> + ExactSizeIterator

pub fn iter(&self) -> impl Iterator<Item = (&String, &DataType)>

Trait Implementations

impl Clone for Schema

fn clone(&self) -> Schema

fn clone_from(&mut self, source: &Self)

impl Debug for Schema

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

impl Default for Schema

fn default() -> Schema

impl<'_, '_> From<&'_ Row<'_>> for Schema

fn from(row: &Row<'_>) -> Schema

impl<I, J> From<I> for Schema where I: IntoIterator<Item = J>, J: Into<Field>,

fn from(flds: I) -> Schema

impl IndexOfSchema for Schema

fn index_of(&self, name: &str) -> Option<usize>

fn try_index_of(&self, name: &str) -> Result<usize, PolarsError>

impl PartialEq<Schema> for Schema

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

fn ne(&self, other: &Schema) -> bool

impl Eq for Schema

impl StructuralEq for Schema

impl StructuralPartialEq for Schema

Auto Trait Implementations

impl RefUnwindSafe for Schema

impl Send for Schema

impl Sync for Schema

impl Unpin for Schema

impl UnwindSafe for Schema

Blanket Implementations

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

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<Q, K> Equivalent<K> for Q where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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

impl<T> From<T> for T

fn from(t: T) -> T

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

fn into(self) -> U

impl<T> Pointable for T

const ALIGN: usize

type Init = T

unsafe fn init(init: <T as Pointable>::Init) -> usize

unsafe fn deref<'a>(ptr: usize) -> &'a T

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

unsafe fn drop(ptr: usize)

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

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

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

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

pub fn try_from_fallible<I>(flds: I) -> Result<Schema, PolarsError> where
I: IntoIterator<Item = Result<Field, PolarsError>>,

pub fn insert_index(
&self,
index: usize,
name: String,
dtype: DataType
) -> Option<Schema>

pub fn get_full(&self, name: &str) -> Option<(usize, &String, &DataType )>

pub fn get_index(&self, index: usize) -> Option<(&String, &DataType )>

pub fn iter(&self) -> impl Iterator<Item = (&String, &DataType )>

impl<I, J> From<I> for Schema where
I: IntoIterator<Item = J>,
J: Into<Field>,

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<Q, K> Equivalent<K> for Q where
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,

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

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

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

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

impl<V, T> VZip<V> for T where
V: MultiLane<T>,