Struct polars::prelude::ParquetReader [−][src]
pub struct ParquetReader<R> { /* fields omitted */ }
Expand description
Read Apache parquet format into a DataFrame.
Implementations
pub fn finish_with_scan_ops(
self,
predicate: Option<Arc<dyn PhysicalIoExpr + 'static>>,
aggregate: Option<&[ScanAggregation]>,
projection: Option<&[usize]>
) -> Result<DataFrame, PolarsError>
Stop parsing when n
rows are parsed. By settings this parameter the csv will be parsed
sequentially.
Trait Implementations
Rechunk to a single chunk after Reading file.
Take the SerReader and return a parsed DataFrame.
Auto Trait Implementations
impl<R> RefUnwindSafe for ParquetReader<R> where
R: RefUnwindSafe,
impl<R> Send for ParquetReader<R> where
R: Send,
impl<R> Sync for ParquetReader<R> where
R: Sync,
impl<R> Unpin for ParquetReader<R> where
R: Unpin,
impl<R> UnwindSafe for ParquetReader<R> where
R: UnwindSafe,