pub struct BatchedParquetReader { /* private fields */ }
Available on crate feature
parquet
only.Implementations§
Source§impl BatchedParquetReader
impl BatchedParquetReader
pub fn new( row_group_fetcher: RowGroupFetcher, metadata: FileMetadataRef, schema: ArrowSchemaRef, slice: (usize, 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>>, include_file_path: Option<(PlSmallStr, Arc<str>)>, parallel: ParallelStrategy, ) -> PolarsResult<Self>
pub fn schema(&self) -> &ArrowSchemaRef
pub fn is_finished(&self) -> bool
pub fn finishes_this_batch(&self, n: usize) -> bool
pub async fn next_batches( &mut self, n: usize, ) -> PolarsResult<Option<Vec<DataFrame>>>
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
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Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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§impl<T> Instrument for T
impl<T> Instrument for T
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Source§impl<T> IntoEither for T
impl<T> IntoEither for T
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Converts
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variant of Either<Self, Self>
if into_left
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Converts self
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
Converts
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Converts self
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