Struct polars::prelude::ndjson::write::Serializer

pub struct Serializer<A, I> where
    A: AsRef<dyn Array + 'static>,
    I: Iterator<Item = Result<A, ArrowError>>,  { /* private fields */ }

This is supported on crate feature io_json only.

FallibleStreamingIterator that serializes an Array to bytes of valid NDJSON where every line is an element of the array.

Implementation

Advancing this iterator CPU-bounded

Implementations

impl<A, I> Serializer<A, I> where
    A: AsRef<dyn Array + 'static>,
    I: Iterator<Item = Result<A, ArrowError>>, 

pub fn new(arrays: I, buffer: Vec<u8, Global>) -> Serializer<A, I>

Creates a new Serializer.

Trait Implementations

impl<A, I> Clone for Serializer<A, I> where
    A: Clone + AsRef<dyn Array + 'static>,
    I: Clone + Iterator<Item = Result<A, ArrowError>>, 

fn clone(&self) -> Serializer<A, I>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<A, I> Debug for Serializer<A, I> where
    A: Debug + AsRef<dyn Array + 'static>,
    I: Debug + Iterator<Item = Result<A, ArrowError>>, 

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

Formats the value using the given formatter.

impl<A, I> FallibleStreamingIterator for Serializer<A, I> where
    A: AsRef<dyn Array + 'static>,
    I: Iterator<Item = Result<A, ArrowError>>, 

type Item = [u8]

The type being iterated over.

type Error = ArrowError

The error type of iteration.

fn advance(&mut self) -> Result<(), ArrowError>

Advances the iterator to the next position.

fn get(&self) -> Option<&<Serializer<A, I> as FallibleStreamingIterator>::Item>

Returns the current element.

fn next(&mut self) -> Result<Option<&Self::Item>, Self::Error>

Advances the iterator, returning the next element.

fn size_hint(&self) -> (usize, Option<usize>)

Returns bounds on the number of remaining elements in the iterator.

fn all<F>(&mut self, f: F) -> Result<bool, Self::Error> where
    F: FnMut(&Self::Item) -> bool, 

Determines if all elements of the iterator satisfy a predicate.

fn any<F>(&mut self, f: F) -> Result<bool, Self::Error> where
    F: FnMut(&Self::Item) -> bool, 

Determines if any elements of the iterator satisfy a predicate.

fn by_ref(&mut self) -> &mut Self

Borrows an iterator, rather than consuming it.

fn count(self) -> Result<usize, Self::Error>

Returns the number of remaining elements in the iterator.

fn filter<F>(self, f: F) -> Filter<Self, F> where
    F: FnMut(&Self::Item) -> bool, 

Returns an iterator which filters elements by a predicate.

fn find<F>(&mut self, f: F) -> Result<Option<&Self::Item>, Self::Error> where
    F: FnMut(&Self::Item) -> bool, 

Returns the first element of the iterator which satisfies a predicate.

fn for_each<F>(self, f: F) -> Result<(), Self::Error> where
    F: FnMut(&Self::Item), 

Calls a closure on each element of an iterator.

fn fuse(self) -> Fuse<Self>

Returns an iterator which is well-behaved at the beginning and end of iteration.

fn map<F, B>(self, f: F) -> Map<Self, F, B> where
    F: FnMut(&Self::Item) -> B, 

Returns an iterator which applies a transform to elements.

fn map_ref<F, B>(self, f: F) -> MapRef<Self, F> where
    F: Fn(&Self::Item) -> &B,
    B: ?Sized, 

Returns an iterator which applies a transform to elements.

fn map_err<F, B>(self, f: F) -> MapErr<Self, F> where
    F: Fn(Self::Error) -> B, 

Returns an iterator that applies a transform to errors.

fn nth(&mut self, n: usize) -> Result<Option<&Self::Item>, Self::Error>

Returns the nth element of the iterator.

fn position<F>(&mut self, f: F) -> Result<Option<usize>, Self::Error> where
    F: FnMut(&Self::Item) -> bool, 

Returns the position of the first element matching a predicate.

fn skip(self, n: usize) -> Skip<Self>

Returns an iterator which skips the first n elements.

fn skip_while<F>(self, f: F) -> SkipWhile<Self, F> where
    F: FnMut(&Self::Item) -> bool, 

Returns an iterator which skips the first sequence of elements matching a predicate.

fn take(self, n: usize) -> Take<Self>

Returns an iterator which only returns the first n elements.

fn take_while<F>(self, f: F) -> TakeWhile<Self, F> where
    F: FnMut(&Self::Item) -> bool, 

Returns an iterator which only returns the first sequence of elements matching a predicate.