parquet::arrow::arrow_reader

Struct ReaderRowGroups

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struct ReaderRowGroups<T: ChunkReader> {
    reader: Arc<T>,
    metadata: Arc<ParquetMetaData>,
    row_groups: Vec<usize>,
}

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§reader: Arc<T>§metadata: Arc<ParquetMetaData>§row_groups: Vec<usize>

Optional list of row group indices to scan

Trait Implementations§

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impl<T: ChunkReader + 'static> RowGroups for ReaderRowGroups<T>

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fn num_rows(&self) -> usize

Get the number of rows in this collection
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fn column_chunks(&self, i: usize) -> Result<Box<dyn PageIterator>>

Returns a PageIterator for the column chunks with the given leaf column index

Auto Trait Implementations§

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impl<T> Freeze for ReaderRowGroups<T>

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impl<T> RefUnwindSafe for ReaderRowGroups<T>
where T: RefUnwindSafe,

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impl<T> Send for ReaderRowGroups<T>

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impl<T> Sync for ReaderRowGroups<T>

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impl<T> Unpin for ReaderRowGroups<T>

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impl<T> UnwindSafe for ReaderRowGroups<T>
where T: RefUnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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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 more
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where F: FnOnce(&Self) -> bool,

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
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type Error = Infallible

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Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T