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arrow.rs
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59 lines (51 loc) · 1.53 KB
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// use arrow::datatypes::SchemaRef;
// use lancedb::arrow::SendableRecordBatchStream;
use std::sync::Arc;
use arrow::{
datatypes::SchemaRef,
pyarrow::{IntoPyArrow, ToPyArrow},
};
use futures::stream::StreamExt;
use lancedb::arrow::SendableRecordBatchStream;
use pyo3::{
exceptions::PyStopAsyncIteration, pyclass, pymethods, Bound, PyAny, PyObject, PyRef, PyResult,
Python,
};
use pyo3_async_runtimes::tokio::future_into_py;
use crate::error::PythonErrorExt;
#[pyclass]
pub struct RecordBatchStream {
schema: SchemaRef,
inner: Arc<tokio::sync::Mutex<SendableRecordBatchStream>>,
}
impl RecordBatchStream {
pub fn new(inner: SendableRecordBatchStream) -> Self {
let schema = inner.schema().clone();
Self {
schema,
inner: Arc::new(tokio::sync::Mutex::new(inner)),
}
}
}
#[pymethods]
impl RecordBatchStream {
#[getter]
pub fn schema(&self, py: Python) -> PyResult<PyObject> {
(*self.schema).clone().into_pyarrow(py)
}
pub fn __aiter__(self_: PyRef<'_, Self>) -> PyRef<'_, Self> {
self_
}
pub fn __anext__(self_: PyRef<'_, Self>) -> PyResult<Bound<'_, PyAny>> {
let inner = self_.inner.clone();
future_into_py(self_.py(), async move {
let inner_next = inner
.lock()
.await
.next()
.await
.ok_or_else(|| PyStopAsyncIteration::new_err(""))?;
Python::with_gil(|py| inner_next.infer_error()?.to_pyarrow(py))
})
}
}