Struct parquet::arrow::arrow_reader::ArrowReaderMetadata

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pub struct ArrowReaderMetadata { /* private fields */ }
Expand description

The cheaply clone-able metadata necessary to construct a ArrowReaderBuilder

This allows loading the metadata for a file once and then using this to construct multiple separate readers, for example, to distribute readers across multiple threads

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impl ArrowReaderMetadata

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pub fn load<T: ChunkReader>( reader: &T, options: ArrowReaderOptions, ) -> Result<Self>

Loads ArrowReaderMetadata from the provided ChunkReader

See ParquetRecordBatchReaderBuilder::new_with_metadata for how this can be used

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pub fn metadata(&self) -> &Arc<ParquetMetaData>

Returns a reference to the ParquetMetaData for this parquet file

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pub fn parquet_schema(&self) -> &SchemaDescriptor

Returns the parquet SchemaDescriptor for this parquet file

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pub fn schema(&self) -> &SchemaRef

Returns the arrow SchemaRef for this parquet file

Trait Implementations§

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impl Clone for ArrowReaderMetadata

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fn clone(&self) -> ArrowReaderMetadata

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ArrowReaderMetadata

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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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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fn into(self) -> U

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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

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

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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,