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| // 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. | ||
|
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| //! Defines the continuance query plan | ||
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| use std::any::Any; | ||
| use std::sync::Arc; | ||
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| use crate::error::{DataFusionError, Result}; | ||
| use crate::physical_plan::{ | ||
| DisplayFormatType, Distribution, ExecutionPlan, Partitioning, | ||
| }; | ||
| use arrow::datatypes::SchemaRef; | ||
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| use super::expressions::PhysicalSortExpr; | ||
| use super::stream::RecordBatchReceiverStream; | ||
| use super::{ | ||
| metrics::{ExecutionPlanMetricsSet, MetricsSet}, | ||
| SendableRecordBatchStream, Statistics, | ||
| }; | ||
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| use crate::execution::context::TaskContext; | ||
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| /// A temporary "working table" operation wehre the input data will be | ||
| /// taken from the named handle during the execution and will be re-published | ||
| /// as is (kind of like a mirror). | ||
| /// | ||
| /// Most notably used in the implementation of recursive queries where the | ||
| /// underlying relation does not exist yet but the data will come as the previous | ||
| /// term is evaluated. | ||
| #[derive(Debug)] | ||
| pub struct ContinuanceExec { | ||
| /// Name of the relation handler | ||
| name: String, | ||
| /// The schema of the stream | ||
| schema: SchemaRef, | ||
| /// Execution metrics | ||
| metrics: ExecutionPlanMetricsSet, | ||
| } | ||
|
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| impl ContinuanceExec { | ||
| /// Create a new execution plan for a continuance stream. The given relation | ||
| /// handler must exist in the task context before calling [`execute`] on this | ||
| /// plan. | ||
| pub fn new(name: String, schema: SchemaRef) -> Self { | ||
| Self { | ||
| name, | ||
| schema, | ||
| metrics: ExecutionPlanMetricsSet::new(), | ||
| } | ||
| } | ||
| } | ||
|
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| impl ExecutionPlan for ContinuanceExec { | ||
| fn as_any(&self) -> &dyn Any { | ||
| self | ||
| } | ||
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| fn schema(&self) -> SchemaRef { | ||
| self.schema.clone() | ||
| } | ||
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| fn children(&self) -> Vec<Arc<dyn ExecutionPlan>> { | ||
| vec![] | ||
| } | ||
|
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| fn required_child_distribution(&self) -> Distribution { | ||
| Distribution::UnspecifiedDistribution | ||
| } | ||
|
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| fn output_partitioning(&self) -> Partitioning { | ||
| Partitioning::UnknownPartitioning(1) | ||
| } | ||
|
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| fn relies_on_input_order(&self) -> bool { | ||
| false | ||
| } | ||
|
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| fn maintains_input_order(&self) -> bool { | ||
| false | ||
| } | ||
|
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| fn benefits_from_input_partitioning(&self) -> bool { | ||
| false | ||
| } | ||
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| fn output_ordering(&self) -> Option<&[PhysicalSortExpr]> { | ||
| None | ||
| } | ||
|
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| fn with_new_children( | ||
| self: Arc<Self>, | ||
| _: Vec<Arc<dyn ExecutionPlan>>, | ||
| ) -> Result<Arc<dyn ExecutionPlan>> { | ||
| Ok(Arc::new(ContinuanceExec::new( | ||
| self.name.clone(), | ||
| self.schema.clone(), | ||
| ))) | ||
| } | ||
|
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| /// This plan does not come with any special streams, but rather we use | ||
| /// the existing [`RecordBatchReceiverStream`] to receive the data from | ||
| /// the registered handle. | ||
| fn execute( | ||
| &self, | ||
| partition: usize, | ||
| context: Arc<TaskContext>, | ||
| ) -> Result<SendableRecordBatchStream> { | ||
| // Continuance streams must be the plan base. | ||
| if partition != 0 { | ||
| return Err(DataFusionError::Internal(format!( | ||
| "ContinuanceExec got an invalid partition {} (expected 0)", | ||
| partition | ||
| ))); | ||
| } | ||
|
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| // The relation handler must be already registered by the | ||
| // parent op. | ||
| let receiver = context.pop_relation_handler(self.name.clone())?; | ||
| Ok(RecordBatchReceiverStream::create_without_handle( | ||
| &self.schema, | ||
| receiver, | ||
| )) | ||
| } | ||
|
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| fn fmt_as( | ||
| &self, | ||
| t: DisplayFormatType, | ||
| f: &mut std::fmt::Formatter, | ||
| ) -> std::fmt::Result { | ||
| match t { | ||
| DisplayFormatType::Default => { | ||
| write!(f, "ContinuanceExec: name={}", self.name) | ||
| } | ||
| } | ||
| } | ||
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| fn metrics(&self) -> Option<MetricsSet> { | ||
| Some(self.metrics.clone_inner()) | ||
| } | ||
|
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| fn statistics(&self) -> Statistics { | ||
| Statistics::default() | ||
| } | ||
| } | ||
|
|
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| #[cfg(test)] | ||
| mod tests {} |
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