Struct polars_io::json::ReaderBuilder

pub struct ReaderBuilder { /* fields omitted */ }

This is supported on crate feature json only.

JSON file reader builder

Implementations

impl ReaderBuilder

pub fn new() -> ReaderBuilder

! Returns a new ReaderBuilder.

pub fn with_schema(self, schema: Arc<Schema>) -> ReaderBuilder

Set the JSON file’s schema

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

Set the JSON reader to infer the schema of the file

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

Set the batch size (number of records to load at one time)

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

Set the reader’s column projection

pub fn build<R>(self, source: R) -> Result<Reader<R>, ArrowError> where
    R: Read + Seek, 

Create a new Reader from the ReaderBuilder

Trait Implementations

impl Debug for ReaderBuilder

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

Formats the value using the given formatter.

impl Default for ReaderBuilder

pub fn default() -> ReaderBuilder

Returns the “default value” for a type.