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refactor(query): csv reader support prefetch (#14983)
* csv reader support prefetch. * fix num of processor in CSV read pipeline. * Update src/query/pipeline/sources/src/prefetch_async_source.rs Co-authored-by: Winter Zhang <coswde@gmail.com> * Update prefetch_async_source.rs * Update src/query/pipeline/sources/src/prefetch_async_source.rs --------- Co-authored-by: Winter Zhang <coswde@gmail.com>
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src/query/pipeline/sources/src/prefetch_async_source.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // Copyright 2021 Datafuse Labs | ||
| // | ||
| // Licensed 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. | ||
|
|
||
| use std::any::Any; | ||
| use std::sync::Arc; | ||
|
|
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| use databend_common_base::base::Progress; | ||
| use databend_common_base::base::ProgressValues; | ||
| use databend_common_base::runtime::profile::Profile; | ||
| use databend_common_base::runtime::profile::ProfileStatisticsName; | ||
| use databend_common_catalog::table_context::TableContext; | ||
| use databend_common_exception::Result; | ||
| use databend_common_expression::DataBlock; | ||
| use databend_common_pipeline_core::processors::Event; | ||
| use databend_common_pipeline_core::processors::EventCause; | ||
| use databend_common_pipeline_core::processors::OutputPort; | ||
| use databend_common_pipeline_core::processors::Processor; | ||
| use databend_common_pipeline_core::processors::ProcessorPtr; | ||
|
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| #[async_trait::async_trait] | ||
| pub trait PrefetchAsyncSource: Send { | ||
| const NAME: &'static str; | ||
| const SKIP_EMPTY_DATA_BLOCK: bool = true; | ||
|
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| #[async_trait::unboxed_simple] | ||
| async fn generate(&mut self) -> Result<Option<DataBlock>>; | ||
| fn is_full(&self, prefetched: &[DataBlock]) -> bool; | ||
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| fn un_reacted(&self) -> Result<()> { | ||
| Ok(()) | ||
| } | ||
| } | ||
|
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| // TODO: This can be refactored using proc macros | ||
| // TODO: Most of its current code is consistent with sync. We need refactor this with better async | ||
| // scheduling after supported expand processors. It will be implemented using a similar dynamic window. | ||
| pub struct PrefetchAsyncSourcer<T: 'static + PrefetchAsyncSource> { | ||
| is_inner_finish: bool, | ||
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| inner: T, | ||
| output: Arc<OutputPort>, | ||
| scan_progress: Arc<Progress>, | ||
| generated_data: Vec<DataBlock>, | ||
| } | ||
|
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| impl<T: 'static + PrefetchAsyncSource> PrefetchAsyncSourcer<T> { | ||
| pub fn create( | ||
| ctx: Arc<dyn TableContext>, | ||
| output: Arc<OutputPort>, | ||
| inner: T, | ||
| ) -> Result<ProcessorPtr> { | ||
| let scan_progress = ctx.get_scan_progress(); | ||
| Ok(ProcessorPtr::create(Box::new(Self { | ||
| inner, | ||
| output, | ||
| scan_progress, | ||
| is_inner_finish: false, | ||
| generated_data: vec![], | ||
| }))) | ||
| } | ||
| } | ||
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| #[async_trait::async_trait] | ||
| impl<T: 'static + PrefetchAsyncSource> Processor for PrefetchAsyncSourcer<T> { | ||
| fn name(&self) -> String { | ||
| T::NAME.to_string() | ||
| } | ||
|
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| fn as_any(&mut self) -> &mut dyn Any { | ||
| self | ||
| } | ||
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| fn event(&mut self) -> Result<Event> { | ||
| if self.is_inner_finish && self.generated_data.is_empty() { | ||
| self.output.finish(); | ||
| return Ok(Event::Finished); | ||
| } | ||
|
|
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| if self.output.is_finished() { | ||
| return Ok(Event::Finished); | ||
| } | ||
|
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| if self.output.can_push() { | ||
| if let Some(data_block) = self.generated_data.pop() { | ||
| self.output.push_data(Ok(data_block)); | ||
| } | ||
| } | ||
|
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| if self.is_inner_finish || self.inner.is_full(&self.generated_data) { | ||
| Ok(Event::NeedConsume) | ||
| } else { | ||
| Ok(Event::Async) | ||
| } | ||
| } | ||
|
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| fn un_reacted(&self, cause: EventCause, _id: usize) -> Result<()> { | ||
| if let EventCause::Output(_) = cause { | ||
| self.inner.un_reacted()?; | ||
| } | ||
|
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| Ok(()) | ||
| } | ||
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| #[async_backtrace::framed] | ||
| async fn async_process(&mut self) -> Result<()> { | ||
| match self.inner.generate().await? { | ||
| None => self.is_inner_finish = true, | ||
| Some(data_block) => { | ||
| // Don't need to record the scan progress of `MaterializedCteSource` | ||
| // Because it reads data from memory. | ||
| if !data_block.is_empty() && self.name() != "MaterializedCteSource" { | ||
| let progress_values = ProgressValues { | ||
| rows: data_block.num_rows(), | ||
| bytes: data_block.memory_size(), | ||
| }; | ||
| self.scan_progress.incr(&progress_values); | ||
| Profile::record_usize_profile( | ||
| ProfileStatisticsName::ScanBytes, | ||
| data_block.memory_size(), | ||
| ); | ||
| } | ||
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| if !T::SKIP_EMPTY_DATA_BLOCK || !data_block.is_empty() { | ||
| self.generated_data.push(data_block) | ||
| } | ||
| } | ||
| }; | ||
|
|
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| Ok(()) | ||
| } | ||
| } |
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