Struct polars_io::json::JsonReader

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

This is supported on crate feature json only.

Implementations

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

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

Set the JSON file’s schema

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

Set the JSON reader to infer the schema of the file

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.

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

Set the reader’s column projection

Trait Implementations

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

fn new(reader: R) -> Self

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

Rechunk to a single chunk after Reading file.

fn finish(self) -> Result<DataFrame>

Take the SerReader and return a parsed DataFrame.