Struct polars::prelude::BatchedParquetReader
source · pub struct BatchedParquetReader { /* private fields */ }Available on crate feature
polars-io only.Implementations§
source§impl BatchedParquetReader
impl BatchedParquetReader
pub fn new( row_group_fetcher: RowGroupFetcher, metadata: Arc<FileMetaData>, schema: Arc<ArrowSchema>, limit: usize, projection: Option<Vec<usize>>, predicate: Option<Arc<dyn PhysicalIoExpr>>, row_index: Option<RowIndex>, chunk_size: usize, use_statistics: bool, hive_partition_columns: Option<Vec<Series>>, parallel: ParallelStrategy ) -> Result<BatchedParquetReader, PolarsError>
pub fn limit_reached(&self) -> bool
pub fn schema(&self) -> &Arc<ArrowSchema>
pub fn is_finished(&self) -> bool
pub fn finishes_this_batch(&self, n: usize) -> bool
pub async fn next_batches( &mut self, n: usize ) -> Result<Option<Vec<DataFrame>>, PolarsError>
Auto Trait Implementations§
impl Freeze for BatchedParquetReader
impl !RefUnwindSafe for BatchedParquetReader
impl Send for BatchedParquetReader
impl Sync for BatchedParquetReader
impl Unpin for BatchedParquetReader
impl !UnwindSafe for BatchedParquetReader
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ
fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ
Converts
self into a Left variant of Either<Self, Self>
if into_left is true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
Converts
self into a Left variant of Either<Self, Self>
if into_left(&self) returns true.
Converts self into a Right variant of Either<Self, Self>
otherwise. Read more