Struct polars_io::json::JsonReader

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pub struct JsonReader<R> where
    R: BufRead + Seek,  { /* private fields */ }

Implementations

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impl<R> JsonReader<R> where
R: BufRead + Seek,

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pub fn with_schema(self, schema: &Schema) -> Self

Set the JSON file’s schema

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pub fn infer_schema_len(self, max_records: Option<usize>) -> Self

Set the JSON reader to infer the schema of the file

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pub fn with_batch_size(self, batch_size: usize) -> Self

Set the batch size (number of records to load at one time) This heavily influences loading time.

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pub fn with_projection(self, projection: Option<Vec<String>>) -> Self

Set the reader’s column projection

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pub fn with_json_format(self, format: JsonFormat) -> Self

Trait Implementations

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impl<R> SerReader<R> for JsonReader<R> where
R: BufRead + Seek,

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fn new(reader: R) -> Self

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fn set_rechunk(self, rechunk: bool) -> Self

Rechunk to a single chunk after Reading file.

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fn finish(self) -> Result<DataFrame>

Take the SerReader and return a parsed DataFrame.

Auto Trait Implementations

impl<R> RefUnwindSafe for JsonReader<R> where
R: RefUnwindSafe,

impl<R> Send for JsonReader<R> where
R: Send,

impl<R> Sync for JsonReader<R> where
R: Sync,

impl<R> Unpin for JsonReader<R> where
R: Unpin,

impl<R> UnwindSafe for JsonReader<R> where
R: UnwindSafe,

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,

const: unstable · source

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,

const: unstable · source

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

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

fn from(t: T) -> T

Returns the argument unchanged.

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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.

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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.

type Init = T

The type for initializers.

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

Initializes a with the given initializer. Read more

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

Dereferences the given pointer. Read more

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

Mutably dereferences the given pointer. Read more

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unsafe fn drop(ptr: usize)

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

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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.

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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.

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

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Struct polars_io::json::JsonReader

Implementations

impl<R> JsonReader<R> where R: BufRead + Seek,

pub fn with_schema(self, schema: &Schema) -> Self

pub fn infer_schema_len(self, max_records: Option<usize>) -> Self

pub fn with_batch_size(self, batch_size: usize) -> Self

pub fn with_projection(self, projection: Option<Vec<String>>) -> Self

pub fn with_json_format(self, format: JsonFormat) -> Self

Trait Implementations

impl<R> SerReader<R> for JsonReader<R> where R: BufRead + Seek,

fn new(reader: R) -> Self

fn set_rechunk(self, rechunk: bool) -> Self

fn finish(self) -> Result<DataFrame>

Auto Trait Implementations

impl<R> RefUnwindSafe for JsonReader<R> where R: RefUnwindSafe,

impl<R> Send for JsonReader<R> where R: Send,

impl<R> Sync for JsonReader<R> where R: Sync,

impl<R> Unpin for JsonReader<R> where R: Unpin,

impl<R> UnwindSafe for JsonReader<R> where R: UnwindSafe,

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<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, 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>

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

fn vzip(self) -> V

impl<R> JsonReader<R> where
R: BufRead + Seek,

impl<R> SerReader<R> for JsonReader<R> where
R: BufRead + Seek,

impl<R> RefUnwindSafe for JsonReader<R> where
R: RefUnwindSafe,

impl<R> Send for JsonReader<R> where
R: Send,

impl<R> Sync for JsonReader<R> where
R: Sync,

impl<R> Unpin for JsonReader<R> where
R: Unpin,

impl<R> UnwindSafe for JsonReader<R> where
R: UnwindSafe,

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

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>,