[−][src]Struct polars::frame::ser::parquet::ParquetReader
This is supported on crate feature
parquet only.Read Apache parquet format into a DataFrame.
Implementations
impl<R> ParquetReader<R> where
R: 'static + Read + Seek + Length + TryClone, [src]
R: 'static + Read + Seek + Length + TryClone,
pub fn with_stop_after_n_rows(self, num_rows: Option<usize>) -> Self[src]
Stop parsing when n rows are parsed. By settings this parameter the csv will be parsed
sequentially.
pub fn schema(self) -> Result<Schema>[src]
Trait Implementations
Auto Trait Implementations
impl<R> RefUnwindSafe for ParquetReader<R> where
R: RefUnwindSafe, [src]
R: RefUnwindSafe,
impl<R> Send for ParquetReader<R> where
R: Send, [src]
R: Send,
impl<R> Sync for ParquetReader<R> where
R: Sync, [src]
R: Sync,
impl<R> Unpin for ParquetReader<R> where
R: Unpin, [src]
R: Unpin,
impl<R> UnwindSafe for ParquetReader<R> where
R: UnwindSafe, [src]
R: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T[src]
impl<T, U> Cast<U> for T where
U: FromCast<T>,
U: FromCast<T>,
pub fn cast(self) -> U
impl<T> From<T> for T[src]
impl<T> FromCast<T> for T
pub fn from_cast(t: T) -> T
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> Pointable for T
pub const ALIGN: usize
type Init = T
The type for initializers.
pub unsafe fn init(init: <T as Pointable>::Init) -> usize
pub unsafe fn deref<'a>(ptr: usize) -> &'a T
pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T
pub unsafe fn drop(ptr: usize)
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,