Struct arrow_flight::decode::FlightRecordBatchStream

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pub struct FlightRecordBatchStream {
    headers: MetadataMap,
    trailers: Option<LazyTrailers>,
    inner: FlightDataDecoder,
}
Expand description

Decodes a [Stream] of FlightData back into [RecordBatch]es. This can be used to decode the response from an Arrow Flight server

§Note

To access the lower level Flight messages (e.g. to access FlightData::app_metadata), you can call Self::into_inner and use the FlightDataDecoder directly.

§Example:

// make a do_get request
use arrow_flight::{
  error::Result,
  decode::FlightRecordBatchStream,
  Ticket,
  flight_service_client::FlightServiceClient
};
use tonic::transport::Channel;
use futures::stream::{StreamExt, TryStreamExt};

let client: FlightServiceClient<Channel> = // make client..

let request = tonic::Request::new(
  Ticket { ticket: Bytes::new() }
);

// Get a stream of FlightData;
let flight_data_stream = client
  .do_get(request)
  .await?
  .into_inner();

// Decode stream of FlightData to RecordBatches
let record_batch_stream = FlightRecordBatchStream::new_from_flight_data(
  // convert tonic::Status to FlightError
  flight_data_stream.map_err(|e| e.into())
);

// Read back RecordBatches
while let Some(batch) = record_batch_stream.next().await {
  match batch {
    Ok(batch) => { /* process batch */ },
    Err(e) => { /* handle error */ },
  };
}

Fields§

§headers: MetadataMap

Optional grpc header metadata.

§trailers: Option<LazyTrailers>

Optional grpc trailer metadata.

§inner: FlightDataDecoder

Implementations§

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impl FlightRecordBatchStream

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pub fn new(inner: FlightDataDecoder) -> Self

Create a new FlightRecordBatchStream from a decoded stream

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pub fn new_from_flight_data<S>(inner: S) -> Self
where S: Stream<Item = Result<FlightData>> + Send + 'static,

Create a new FlightRecordBatchStream from a stream of FlightData

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pub fn with_headers(self, headers: MetadataMap) -> Self

Record response headers.

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pub fn with_trailers(self, trailers: LazyTrailers) -> Self

Record response trailers.

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pub fn headers(&self) -> &MetadataMap

Headers attached to this stream.

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pub fn trailers(&self) -> Option<MetadataMap>

Trailers attached to this stream.

Note that this will return None until the entire stream is consumed. Only after calling next() returns None, might any available trailers be returned.

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pub fn got_schema(&self) -> bool

👎Deprecated: use schema().is_some() instead

Has a message defining the schema been received yet?

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pub fn schema(&self) -> Option<&SchemaRef>

Return schema for the stream, if it has been received

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pub fn into_inner(self) -> FlightDataDecoder

Consume self and return the wrapped FlightDataDecoder

Trait Implementations§

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impl Debug for FlightRecordBatchStream

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

Formats the value using the given formatter. Read more
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impl Stream for FlightRecordBatchStream

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fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<RecordBatch>>>

Returns the next [RecordBatch] available in this stream, or None if there are no further results available.

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type Item = Result<RecordBatch, FlightError>

Values yielded by the stream.
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fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more

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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
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impl<T> IntoStreamingRequest for T
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type Stream = T

The RPC request stream type
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type Message = <T as Stream>::Item

The RPC request type
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fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>
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fn take(self, n: usize) -> Take<Self>
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Creates a new stream of at most n items of the underlying stream. Read more
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Creates a new stream which skips n items of the underlying stream. Read more
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Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more
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fn chunks(self, capacity: usize) -> Chunks<Self>
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An adaptor for chunking up items of the stream inside a vector. Read more
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An adaptor for chunking up ready items of the stream inside a vector. Read more
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fn forward<S>(self, sink: S) -> Forward<Self, S>
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type Error = Infallible

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Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
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fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>
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Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
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fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F>
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Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F>
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Take elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> TryForEachConcurrent<Self, Fut, F>
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Attempts to run this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available, exiting as soon as an error occurs. Read more
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fn try_chunks(self, capacity: usize) -> TryChunks<Self>
where Self: Sized,

An adaptor for chunking up successful items of the stream inside a vector. Read more
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fn try_ready_chunks(self, capacity: usize) -> TryReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up successful, ready items of the stream inside a vector. Read more
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fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>
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fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>
where Fut: TryFuture<Ok = Option<T>, Error = Self::Error>, F: FnMut(Self::Ok) -> Fut, Self: Sized,

Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
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fn try_flatten_unordered( self, limit: impl Into<Option<usize>>, ) -> TryFlattenUnordered<Self>
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Flattens a stream of streams into just one continuous stream. Produced streams will be polled concurrently and any errors will be passed through without looking at them. If the underlying base stream returns an error, it will be immediately propagated. Read more
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fn try_flatten(self) -> TryFlatten<Self>
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fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>
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fn try_concat(self) -> TryConcat<Self>
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fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently (unordered). Read more
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fn try_buffered(self, n: usize) -> TryBuffered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently. Read more
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fn try_poll_next_unpin( &mut self, cx: &mut Context<'_>, ) -> Poll<Option<Result<Self::Ok, Self::Error>>>
where Self: Unpin,

A convenience method for calling [TryStream::try_poll_next] on Unpin stream types.
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fn into_async_read(self) -> IntoAsyncRead<Self>
where Self: Sized + TryStreamExt<Error = Error>, Self::Ok: AsRef<[u8]>,

Adapter that converts this stream into an AsyncBufRead. Read more
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fn try_all<Fut, F>(self, f: F) -> TryAll<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if all items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that does not satisfy the predicate. Read more
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fn try_any<Fut, F>(self, f: F) -> TryAny<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if any items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that satisfies the predicate. Read more
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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> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more