pub struct ArrowStreamReader<'a> { /* private fields */ }Expand description
Streaming Arrow IPC reader.
Reads the schema message on construction, then delivers record batches one
at a time via read_next_batch until the EOS
marker is encountered.
Implementations§
Source§impl<'a> ArrowStreamReader<'a>
impl<'a> ArrowStreamReader<'a>
Sourcepub fn new(reader: &'a mut dyn Read) -> Result<Self>
pub fn new(reader: &'a mut dyn Read) -> Result<Self>
Create a new streaming reader.
Reads and parses the schema message from reader.
Sourcepub fn read_next_batch(&mut self) -> Result<Option<RecordBatch>>
pub fn read_next_batch(&mut self) -> Result<Option<RecordBatch>>
Read the next record batch from the stream.
Returns Ok(None) when the EOS marker has been reached or the stream
is already exhausted.
Sourcepub fn schema(&self) -> &ArrowSchema
pub fn schema(&self) -> &ArrowSchema
Schema read from the stream header.
Sourcepub fn batches_read(&self) -> usize
pub fn batches_read(&self) -> usize
Number of batches read so far.
Sourcepub fn is_finished(&self) -> bool
pub fn is_finished(&self) -> bool
Whether the EOS marker has been encountered.
Sourcepub fn collect_all(&mut self) -> Result<Vec<RecordBatch>>
pub fn collect_all(&mut self) -> Result<Vec<RecordBatch>>
Convenience: read all remaining batches into a Vec.
Auto Trait Implementations§
impl<'a> !RefUnwindSafe for ArrowStreamReader<'a>
impl<'a> !Send for ArrowStreamReader<'a>
impl<'a> !Sync for ArrowStreamReader<'a>
impl<'a> !UnwindSafe for ArrowStreamReader<'a>
impl<'a> Freeze for ArrowStreamReader<'a>
impl<'a> Unpin for ArrowStreamReader<'a>
impl<'a> UnsafeUnpin for ArrowStreamReader<'a>
Blanket Implementations§
Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
Source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
Source§impl<T> Instrument for T
impl<T> Instrument for T
Source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
Source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
Source§impl<T> IntoEither for T
impl<T> IntoEither for T
Source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moreSource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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 moreSource§impl<T> IntoRequest<T> for T
impl<T> IntoRequest<T> for T
Source§fn into_request(self) -> Request<T>
fn into_request(self) -> Request<T>
Wrap the input message
T in a tonic::RequestSource§impl<T> Pointable for T
impl<T> Pointable for T
Source§impl<T> PolicyExt for Twhere
T: ?Sized,
impl<T> PolicyExt for Twhere
T: ?Sized,
impl<T> Read<Exclusive, BecauseExclusive> for Twhere
T: ?Sized,
Source§impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
impl<SS, SP> SupersetOf<SS> for SPwhere
SS: SubsetOf<SP>,
Source§fn to_subset(&self) -> Option<SS>
fn to_subset(&self) -> Option<SS>
The inverse inclusion map: attempts to construct
self from the equivalent element of its
superset. Read moreSource§fn is_in_subset(&self) -> bool
fn is_in_subset(&self) -> bool
Checks if
self is actually part of its subset T (and can be converted to it).Source§fn to_subset_unchecked(&self) -> SS
fn to_subset_unchecked(&self) -> SS
Use with care! Same as
self.to_subset but without any property checks. Always succeeds.Source§fn from_subset(element: &SS) -> SP
fn from_subset(element: &SS) -> SP
The inclusion map: converts
self to the equivalent element of its superset.