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Minor: Avoid copying all expressions in Analzyer / check_plan #9974

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Apr 7, 2024
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Minor: Avoid copying all expressions in Analzyer / check_plan #9974

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24 changes: 13 additions & 11 deletions datafusion/optimizer/src/analyzer/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,6 @@ use datafusion_common::{DataFusionError, Result};
use datafusion_expr::expr::Exists;
use datafusion_expr::expr::InSubquery;
use datafusion_expr::expr_rewriter::FunctionRewrite;
use datafusion_expr::utils::inspect_expr_pre;
use datafusion_expr::{Expr, LogicalPlan};

use crate::analyzer::count_wildcard_rule::CountWildcardRule;
Expand Down Expand Up @@ -156,18 +155,21 @@ impl Analyzer {
/// Do necessary check and fail the invalid plan
fn check_plan(plan: &LogicalPlan) -> Result<()> {
plan.apply(&mut |plan: &LogicalPlan| {
for expr in plan.expressions().iter() {
plan.inspect_expressions(|expr| {
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this is the line that voids a copy

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A great catch! expressions() will invoke clone() inside, we can notice it to reduce some loss

// recursively look for subqueries
inspect_expr_pre(expr, |expr| match expr {
Expr::Exists(Exists { subquery, .. })
| Expr::InSubquery(InSubquery { subquery, .. })
| Expr::ScalarSubquery(subquery) => {
check_subquery_expr(plan, &subquery.subquery, expr)
}
_ => Ok(()),
expr.apply(&mut |expr| {
match expr {
Expr::Exists(Exists { subquery, .. })
| Expr::InSubquery(InSubquery { subquery, .. })
| Expr::ScalarSubquery(subquery) => {
check_subquery_expr(plan, &subquery.subquery, expr)?;
}
_ => {}
};
Ok(TreeNodeRecursion::Continue)
})?;
}

Ok::<(), DataFusionError>(())
})?;
Ok(TreeNodeRecursion::Continue)
})?;

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