wiedld commented on code in PR #7379:
URL: https://github.com/apache/arrow-datafusion/pull/7379#discussion_r1326910418
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datafusion/core/src/physical_plan/sorts/cascade.rs:
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@@ -0,0 +1,247 @@
+use crate::physical_plan::metrics::BaselineMetrics;
+use crate::physical_plan::sorts::builder::SortOrder;
+use crate::physical_plan::sorts::cursor::Cursor;
+use crate::physical_plan::sorts::merge::SortPreservingMergeStream;
+use crate::physical_plan::sorts::stream::{
+ BatchCursorStream, BatchId, BatchTrackingStream, MergeStream,
OffsetCursorStream,
+ YieldedCursorStream,
+};
+use crate::physical_plan::stream::ReceiverStream;
+use crate::physical_plan::RecordBatchStream;
+
+use arrow::compute::interleave;
+use arrow::datatypes::SchemaRef;
+use arrow::record_batch::RecordBatch;
+use datafusion_common::Result;
+use datafusion_execution::memory_pool::MemoryReservation;
+use futures::{Stream, StreamExt};
+use std::collections::{HashMap, VecDeque};
+use std::pin::Pin;
+use std::sync::Arc;
+use std::task::{Context, Poll};
+
+pub(crate) struct SortPreservingCascadeStream<C: Cursor> {
Review Comment:
What do you think [about
this](https://github.com/apache/arrow-datafusion/blob/3786021a2e087ee1576ab7be0becc01c75fa95e9/datafusion/core/src/physical_plan/sorts/cascade.rs#L25-L76)?
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