[−][src]Struct arrow::ipc::reader::FileReader
Arrow File reader
Methods
impl<R: Read + Seek> FileReader<R>
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pub fn try_new(reader: R) -> Result<Self>
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Try to create a new file reader
Returns errors if the file does not meet the Arrow Format header and footer requirements
pub fn num_batches(&self) -> usize
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Return the number of batches in the file
pub fn schema(&self) -> SchemaRef
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Return the schema of the file
pub fn next(&mut self) -> Result<Option<RecordBatch>>
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Read the next record batch
pub fn set_index(&mut self, index: usize) -> Result<()>
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Read a specific record batch
Sets the current block to the index, allowing random reads
Trait Implementations
impl<R: Read + Seek> RecordBatchReader for FileReader<R>
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fn schema(&mut self) -> SchemaRef
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fn next_batch(&mut self) -> Result<Option<RecordBatch>>
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Auto Trait Implementations
impl<R> RefUnwindSafe for FileReader<R> where
R: RefUnwindSafe,
R: RefUnwindSafe,
impl<R> Send for FileReader<R> where
R: Send,
R: Send,
impl<R> Sync for FileReader<R> where
R: Sync,
R: Sync,
impl<R> Unpin for FileReader<R> where
R: Unpin,
R: Unpin,
impl<R> UnwindSafe for FileReader<R> where
R: UnwindSafe,
R: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T, U> Cast<U> for T where
U: FromCast<T>,
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U: FromCast<T>,
impl<T> From<T> for T
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impl<T> FromCast<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,