alamb commented on code in PR #15700: URL: https://github.com/apache/datafusion/pull/15700#discussion_r2240660130
########## datafusion/physical-plan/src/sorts/multi_level_merge.rs: ########## @@ -0,0 +1,449 @@ +// 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. + +//! Create a stream that do a multi level merge stream + +use crate::metrics::BaselineMetrics; +use crate::{EmptyRecordBatchStream, SpillManager}; +use arrow::array::RecordBatch; +use std::fmt::{Debug, Formatter}; +use std::mem; +use std::pin::Pin; +use std::sync::Arc; +use std::task::{Context, Poll}; + +use arrow::datatypes::SchemaRef; +use datafusion_common::Result; +use datafusion_execution::memory_pool::MemoryReservation; + +use crate::sorts::sort::get_reserved_byte_for_record_batch_size; +use crate::sorts::streaming_merge::{SortedSpillFile, StreamingMergeBuilder}; +use crate::stream::RecordBatchStreamAdapter; +use datafusion_execution::{RecordBatchStream, SendableRecordBatchStream}; +use datafusion_physical_expr_common::sort_expr::LexOrdering; +use futures::TryStreamExt; +use futures::{Stream, StreamExt}; + +/// Merges a stream of sorted cursors and record batches into a single sorted stream +/// +/// This is a wrapper around [`SortPreservingMergeStream`](crate::sorts::merge::SortPreservingMergeStream) +/// that provide it the sorted streams/files to merge while making sure we can merge them in memory. +/// In case we can't merge all of them in a single pass we will spill the intermediate results to disk +/// and repeat the process. +/// +/// ## High level Algorithm +/// 1. Get the maximum amount of sorted in-memory streams and spill files we can merge with the available memory +/// 2. Sort them to a sorted stream +/// 3. Do we have more spill files to merge? +/// - Yes: write that sorted stream to a spill file, +/// add that spill file back to the spill files to merge and +/// repeat the process +/// +/// - No: return that sorted stream as the final output stream +/// +/// ```text +/// Initial State: Multiple sorted streams + spill files Review Comment: 😍 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
