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refactor(7181): move streaming_merge() into separate mod from the mer…
…ge mod. (#7799) Merge mod has the SortPreservingMergeStream, containing the loser tree. This SortPreservingMergeStream struct will be used repeatedly as part of the cascading merge; in turn, the cascading merge will be implemented for the streaming_merge() method.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| //! Merge that deals with an arbitrary size of streaming inputs. | ||
| //! This is an order-preserving merge. | ||
| use crate::metrics::BaselineMetrics; | ||
| use crate::sorts::{ | ||
| merge::SortPreservingMergeStream, | ||
| stream::{FieldCursorStream, RowCursorStream}, | ||
| }; | ||
| use crate::{PhysicalSortExpr, SendableRecordBatchStream}; | ||
| use arrow::datatypes::{DataType, SchemaRef}; | ||
| use arrow_array::*; | ||
| use datafusion_common::Result; | ||
| use datafusion_execution::memory_pool::MemoryReservation; | ||
|
|
||
| macro_rules! primitive_merge_helper { | ||
| ($t:ty, $($v:ident),+) => { | ||
| merge_helper!(PrimitiveArray<$t>, $($v),+) | ||
| }; | ||
| } | ||
|
|
||
| macro_rules! merge_helper { | ||
| ($t:ty, $sort:ident, $streams:ident, $schema:ident, $tracking_metrics:ident, $batch_size:ident, $fetch:ident, $reservation:ident) => {{ | ||
| let streams = FieldCursorStream::<$t>::new($sort, $streams); | ||
| return Ok(Box::pin(SortPreservingMergeStream::new( | ||
| Box::new(streams), | ||
| $schema, | ||
| $tracking_metrics, | ||
| $batch_size, | ||
| $fetch, | ||
| $reservation, | ||
| ))); | ||
| }}; | ||
| } | ||
|
|
||
| /// Perform a streaming merge of [`SendableRecordBatchStream`] based on provided sort expressions | ||
| /// while preserving order. | ||
| pub fn streaming_merge( | ||
| streams: Vec<SendableRecordBatchStream>, | ||
| schema: SchemaRef, | ||
| expressions: &[PhysicalSortExpr], | ||
| metrics: BaselineMetrics, | ||
| batch_size: usize, | ||
| fetch: Option<usize>, | ||
| reservation: MemoryReservation, | ||
| ) -> Result<SendableRecordBatchStream> { | ||
| // Special case single column comparisons with optimized cursor implementations | ||
| if expressions.len() == 1 { | ||
| let sort = expressions[0].clone(); | ||
| let data_type = sort.expr.data_type(schema.as_ref())?; | ||
| downcast_primitive! { | ||
| data_type => (primitive_merge_helper, sort, streams, schema, metrics, batch_size, fetch, reservation), | ||
| DataType::Utf8 => merge_helper!(StringArray, sort, streams, schema, metrics, batch_size, fetch, reservation) | ||
| DataType::LargeUtf8 => merge_helper!(LargeStringArray, sort, streams, schema, metrics, batch_size, fetch, reservation) | ||
| DataType::Binary => merge_helper!(BinaryArray, sort, streams, schema, metrics, batch_size, fetch, reservation) | ||
| DataType::LargeBinary => merge_helper!(LargeBinaryArray, sort, streams, schema, metrics, batch_size, fetch, reservation) | ||
| _ => {} | ||
| } | ||
| } | ||
|
|
||
| let streams = RowCursorStream::try_new( | ||
| schema.as_ref(), | ||
| expressions, | ||
| streams, | ||
| reservation.new_empty(), | ||
| )?; | ||
|
|
||
| Ok(Box::pin(SortPreservingMergeStream::new( | ||
| Box::new(streams), | ||
| schema, | ||
| metrics, | ||
| batch_size, | ||
| fetch, | ||
| reservation, | ||
| ))) | ||
| } |