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Add Analyzer phase to DataFusion , add basic validation logic to Subq…
…uery Plans and Expressions (#5570) * Add a rule based Analyzer, add basic check for SubQuery expressions * remove the failed UT, add comments
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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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use crate::rewrite::TreeNodeRewritable; | ||
use datafusion_common::config::ConfigOptions; | ||
use datafusion_common::{DataFusionError, Result}; | ||
use datafusion_expr::expr_visitor::inspect_expr_pre; | ||
use datafusion_expr::{Expr, LogicalPlan}; | ||
use log::{debug, trace}; | ||
use std::sync::Arc; | ||
use std::time::Instant; | ||
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/// `AnalyzerRule` transforms the unresolved ['LogicalPlan']s and unresolved ['Expr']s into | ||
/// the resolved form. | ||
pub trait AnalyzerRule { | ||
/// Rewrite `plan` | ||
fn analyze(&self, plan: &LogicalPlan, config: &ConfigOptions) -> Result<LogicalPlan>; | ||
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/// A human readable name for this analyzer rule | ||
fn name(&self) -> &str; | ||
} | ||
/// A rule-based Analyzer. | ||
#[derive(Clone)] | ||
pub struct Analyzer { | ||
/// All rules to apply | ||
pub rules: Vec<Arc<dyn AnalyzerRule + Send + Sync>>, | ||
} | ||
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impl Default for Analyzer { | ||
fn default() -> Self { | ||
Self::new() | ||
} | ||
} | ||
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impl Analyzer { | ||
/// Create a new analyzer using the recommended list of rules | ||
pub fn new() -> Self { | ||
let rules = vec![]; | ||
Self::with_rules(rules) | ||
} | ||
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/// Create a new analyzer with the given rules | ||
pub fn with_rules(rules: Vec<Arc<dyn AnalyzerRule + Send + Sync>>) -> Self { | ||
Self { rules } | ||
} | ||
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/// Analyze the logical plan by applying analyzer rules, and | ||
/// do necessary check and fail the invalid plans | ||
pub fn execute_and_check( | ||
&self, | ||
plan: &LogicalPlan, | ||
config: &ConfigOptions, | ||
) -> Result<LogicalPlan> { | ||
let start_time = Instant::now(); | ||
let mut new_plan = plan.clone(); | ||
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// TODO add common rule executor for Analyzer and Optimizer | ||
for rule in &self.rules { | ||
new_plan = rule.analyze(&new_plan, config)?; | ||
} | ||
check_plan(&new_plan)?; | ||
log_plan("Final analyzed plan", &new_plan); | ||
debug!("Analyzer took {} ms", start_time.elapsed().as_millis()); | ||
Ok(new_plan) | ||
} | ||
} | ||
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/// Log the plan in debug/tracing mode after some part of the optimizer runs | ||
fn log_plan(description: &str, plan: &LogicalPlan) { | ||
debug!("{description}:\n{}\n", plan.display_indent()); | ||
trace!("{description}::\n{}\n", plan.display_indent_schema()); | ||
} | ||
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/// Do necessary check and fail the invalid plan | ||
fn check_plan(plan: &LogicalPlan) -> Result<()> { | ||
plan.for_each_up(&|plan: &LogicalPlan| { | ||
plan.expressions().into_iter().try_for_each(|expr| { | ||
// recursively look for subqueries | ||
inspect_expr_pre(&expr, |expr| match expr { | ||
Expr::Exists { subquery, .. } | ||
| Expr::InSubquery { subquery, .. } | ||
| Expr::ScalarSubquery(subquery) => { | ||
check_subquery_expr(plan, &subquery.subquery, expr) | ||
} | ||
_ => Ok(()), | ||
}) | ||
}) | ||
}) | ||
} | ||
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/// Do necessary check on subquery expressions and fail the invalid plan | ||
/// 1) Check whether the outer plan is in the allowed outer plans list to use subquery expressions, | ||
/// the allowed while list: [Projection, Filter, Window, Aggregate, Sort, Join]. | ||
/// 2) Check whether the inner plan is in the allowed inner plans list to use correlated(outer) expressions. | ||
/// 3) Check and validate unsupported cases to use the correlated(outer) expressions inside the subquery(inner) plans/inner expressions. | ||
/// For example, we do not want to support to use correlated expressions as the Join conditions in the subquery plan when the Join | ||
/// is a Full Out Join | ||
fn check_subquery_expr( | ||
outer_plan: &LogicalPlan, | ||
inner_plan: &LogicalPlan, | ||
expr: &Expr, | ||
) -> Result<()> { | ||
check_plan(inner_plan)?; | ||
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// Scalar subquery should only return one column | ||
if matches!(expr, Expr::ScalarSubquery(subquery) if subquery.subquery.schema().fields().len() > 1) | ||
{ | ||
return Err(DataFusionError::Plan( | ||
"Scalar subquery should only return one column".to_string(), | ||
)); | ||
} | ||
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match outer_plan { | ||
LogicalPlan::Projection(_) | ||
| LogicalPlan::Filter(_) | ||
| LogicalPlan::Window(_) | ||
| LogicalPlan::Aggregate(_) | ||
| LogicalPlan::Join(_) => Ok(()), | ||
LogicalPlan::Sort(_) => match expr { | ||
Expr::InSubquery { .. } | Expr::Exists { .. } => Err(DataFusionError::Plan( | ||
"In/Exist subquery can not be used in Sort plan nodes".to_string(), | ||
)), | ||
Expr::ScalarSubquery(_) => Ok(()), | ||
_ => Ok(()), | ||
}, | ||
_ => Err(DataFusionError::Plan( | ||
"Subquery can only be used in Projection, Filter, \ | ||
Window functions, Aggregate, Sort and Join plan nodes" | ||
.to_string(), | ||
)), | ||
}?; | ||
check_correlations_in_subquery(outer_plan, inner_plan, expr, true) | ||
} | ||
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// Recursively check the unsupported outer references in the sub query plan. | ||
fn check_correlations_in_subquery( | ||
outer_plan: &LogicalPlan, | ||
inner_plan: &LogicalPlan, | ||
expr: &Expr, | ||
can_contain_outer_ref: bool, | ||
) -> Result<()> { | ||
// We want to support as many operators as possible inside the correlated subquery | ||
if !can_contain_outer_ref && contains_outer_reference(outer_plan, inner_plan, expr) { | ||
return Err(DataFusionError::Plan( | ||
"Accessing outer reference column is not allowed in the plan".to_string(), | ||
)); | ||
} | ||
match inner_plan { | ||
LogicalPlan::Projection(_) | ||
| LogicalPlan::Filter(_) | ||
| LogicalPlan::Window(_) | ||
| LogicalPlan::Aggregate(_) | ||
| LogicalPlan::Distinct(_) | ||
| LogicalPlan::Sort(_) | ||
| LogicalPlan::CrossJoin(_) | ||
| LogicalPlan::Union(_) | ||
| LogicalPlan::TableScan(_) | ||
| LogicalPlan::EmptyRelation(_) | ||
| LogicalPlan::Limit(_) | ||
| LogicalPlan::Subquery(_) | ||
| LogicalPlan::SubqueryAlias(_) => inner_plan.apply_children(|plan| { | ||
check_correlations_in_subquery(outer_plan, plan, expr, can_contain_outer_ref) | ||
}), | ||
LogicalPlan::Join(_) => { | ||
// TODO support correlation columns in the subquery join | ||
inner_plan.apply_children(|plan| { | ||
check_correlations_in_subquery( | ||
outer_plan, | ||
plan, | ||
expr, | ||
can_contain_outer_ref, | ||
) | ||
}) | ||
} | ||
_ => Err(DataFusionError::Plan( | ||
"Unsupported operator in the subquery plan.".to_string(), | ||
)), | ||
} | ||
} | ||
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fn contains_outer_reference( | ||
_outer_plan: &LogicalPlan, | ||
_inner_plan: &LogicalPlan, | ||
_expr: &Expr, | ||
) -> bool { | ||
// TODO check outer references | ||
false | ||
} |
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