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use std::{any::Any, sync::Arc};
use datafusion::arrow::{array::RecordBatch, datatypes::SchemaRef};
use datafusion::physical_plan::execution_plan::{Boundedness, EmissionType};
use datafusion::{
common::Statistics,
error::{DataFusionError, Result},
execution::{SendableRecordBatchStream, TaskContext},
physical_expr::EquivalenceProperties,
physical_plan::{
common,
stream::{RecordBatchReceiverStream, RecordBatchStreamAdapter},
DisplayAs, DisplayFormatType, ExecutionPlan, Partitioning, PlanProperties,
},
};
/// A Mock ExecutionPlan that can be used for writing tests of other
/// ExecutionPlans
#[derive(Debug)]
pub struct MockExec {
/// the results to send back
data: Vec<Result<RecordBatch>>,
schema: SchemaRef,
/// if true (the default), sends data using a separate task to ensure the
/// batches are not available without this stream yielding first
use_task: bool,
cache: Arc<PlanProperties>,
}
impl MockExec {
/// Create a new `MockExec` with a single partition that returns
/// the specified `Results`s.
///
/// By default, the batches are not produced immediately (the
/// caller has to actually yield and another task must run) to
/// ensure any poll loops are correct. This behavior can be
/// changed with `with_use_task`
pub fn new(data: Vec<Result<RecordBatch>>, schema: SchemaRef) -> Self {
let cache = Arc::new(Self::compute_properties(Arc::clone(&schema)));
Self {
data,
schema,
use_task: true,
cache,
}
}
/// If `use_task` is true (the default) then the batches are sent
/// back using a separate task to ensure the underlying stream is
/// not immediately ready
pub fn with_use_task(mut self, use_task: bool) -> Self {
self.use_task = use_task;
self
}
/// This function creates the cache object that stores the plan properties such as schema, equivalence properties, ordering, partitioning, etc.
fn compute_properties(schema: SchemaRef) -> PlanProperties {
let eq_properties = EquivalenceProperties::new(schema);
PlanProperties::new(
eq_properties,
Partitioning::UnknownPartitioning(1),
EmissionType::Incremental,
Boundedness::Bounded,
)
}
}
impl DisplayAs for MockExec {
fn fmt_as(&self, t: DisplayFormatType, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match t {
DisplayFormatType::Default
| DisplayFormatType::Verbose
| DisplayFormatType::TreeRender => {
write!(f, "MockExec")
}
}
}
}
impl ExecutionPlan for MockExec {
fn name(&self) -> &'static str {
Self::static_name()
}
fn as_any(&self) -> &dyn Any {
self
}
fn properties(&self) -> &Arc<PlanProperties> {
&self.cache
}
fn children(&self) -> Vec<&Arc<dyn ExecutionPlan>> {
vec![]
}
fn with_new_children(
self: Arc<Self>,
_: Vec<Arc<dyn ExecutionPlan>>,
) -> Result<Arc<dyn ExecutionPlan>> {
unimplemented!()
}
/// Returns a stream which yields data
fn execute(
&self,
partition: usize,
_context: Arc<TaskContext>,
) -> Result<SendableRecordBatchStream> {
assert_eq!(partition, 0);
// Result doesn't implement clone, so do it ourself
let data: Vec<_> = self
.data
.iter()
.map(|r| match r {
Ok(batch) => Ok(batch.clone()),
Err(e) => Err(clone_error(e)),
})
.collect();
if self.use_task {
let mut builder = RecordBatchReceiverStream::builder(self.schema(), 2);
// send data in order but in a separate task (to ensure
// the batches are not available without the stream
// yielding).
let tx = builder.tx();
builder.spawn(async move {
for batch in data {
println!("Sending batch via delayed stream");
if let Err(e) = tx.send(batch).await {
println!("ERROR batch via delayed stream: {e}");
}
}
Ok(())
});
// returned stream simply reads off the rx stream
Ok(builder.build())
} else {
// make an input that will error
let stream = futures::stream::iter(data);
Ok(Box::pin(RecordBatchStreamAdapter::new(
self.schema(),
stream,
)))
}
}
// Panics if one of the batches is an error
fn partition_statistics(&self, _partition: Option<usize>) -> Result<Statistics> {
let data: Result<Vec<_>> = self
.data
.iter()
.map(|r| match r {
Ok(batch) => Ok(batch.clone()),
Err(e) => Err(clone_error(e)),
})
.collect();
let data = data?;
Ok(common::compute_record_batch_statistics(
&[data],
&self.schema,
None,
))
}
}
fn clone_error(e: &DataFusionError) -> DataFusionError {
use DataFusionError::*;
match e {
Execution(msg) => Execution(msg.to_string()),
_ => unimplemented!(),
}
}