Struct polars_io::csv_core::csv::CoreReader

pub struct CoreReader<R: Read + MmapBytesReader> { /* fields omitted */ }

This is supported on crate feature csv-file only.

CSV file reader

Implementations

impl<R: Read + Sync + Send + MmapBytesReader> CoreReader<R>

pub fn schema(&self) -> SchemaRef

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

pub fn as_df(
    &mut self,
    predicate: Option<Arc<dyn PhysicalIoExpr>>,
    aggregate: Option<&[ScanAggregation]>
) -> Result<DataFrame>

Read the csv into a DataFrame. The predicate can come from a lazy physical plan.

Trait Implementations

impl<R> Debug for CoreReader<R> where
    R: Read + MmapBytesReader, 

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

Formats the value using the given formatter.