Struct polars::prelude::JsonLineReader

pub struct JsonLineReader<'a, R> where
    R: MmapBytesReader, { /* private fields */ }

Implementations

impl<'a, R> JsonLineReader<'a, R> where
    R: 'a + MmapBytesReader, 

pub fn with_n_rows(self, num_rows: Option<usize>) -> JsonLineReader<'a, R>

pub fn with_schema(self, schema: &'a Schema) -> JsonLineReader<'a, R>

pub fn with_rechunk(self, rechunk: bool) -> JsonLineReader<'a, R>

pub fn infer_schema_len(
    self,
    infer_schema_len: Option<usize>
) -> JsonLineReader<'a, R>

pub fn with_n_threads(self, n: Option<usize>) -> JsonLineReader<'a, R>

pub fn with_path<P>(self, path: Option<P>) -> JsonLineReader<'a, R> where
    P: Into<PathBuf>, 

pub fn with_chunk_size(self, chunk_size: usize) -> JsonLineReader<'a, R>

Sets the chunk size used by the parser. This influences performance

pub fn low_memory(self, toggle: bool) -> JsonLineReader<'a, R>

Reduce memory consumption at the expense of performance

impl<'a> JsonLineReader<'a, File>

pub fn from_path<P>(path: P) -> Result<JsonLineReader<'a, File>, PolarsError> where
    P: Into<PathBuf>, 

This is the recommended way to create a json reader as this allows for fastest parsing.

Trait Implementations

impl<'a, R> SerReader<R> for JsonLineReader<'a, R> where
    R: MmapBytesReader, 

fn new(reader: R) -> JsonLineReader<'a, R>

Create a new JsonLineReader from a file/ stream

fn finish(self) -> Result<DataFrame, PolarsError>

Take the SerReader and return a parsed DataFrame.

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

Rechunk to a single chunk after Reading file.