Struct arrow::json::reader::Reader

pub struct Reader<R: Read> { /* fields omitted */ }

JSON file reader

Implementations

impl<R: Read> Reader<R>

pub fn new(
    reader: R,
    schema: SchemaRef,
    batch_size: usize,
    projection: Option<Vec<String>>
) -> Self

Create a new JSON Reader from any value that implements the Read trait.

If reading a File, you can customise the Reader, such as to enable schema inference, use ReaderBuilder.

pub fn from_buf_reader(
    reader: BufReader<R>,
    schema: SchemaRef,
    batch_size: usize,
    projection: Option<Vec<String>>
) -> Self

Create a new JSON Reader from a BufReader<R: Read>

To customize the schema, such as to enable schema inference, use ReaderBuilder

pub fn schema(&self) -> SchemaRef

Returns the schema of the reader, useful for getting the schema without reading record batches

pub fn next(&mut self) -> Result<Option<RecordBatch>>

Read the next batch of records

Trait Implementations

impl<R: Debug + Read> Debug for Reader<R>

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

Formats the value using the given formatter.