neilconway commented on code in PR #21240:
URL: https://github.com/apache/datafusion/pull/21240#discussion_r3080086716
##########
datafusion/expr/src/execution_props.rs:
##########
@@ -42,6 +55,12 @@ pub struct ExecutionProps {
pub config_options: Option<Arc<ConfigOptions>>,
/// Providers for scalar variables
pub var_providers: Option<HashMap<VarType, Arc<dyn VarProvider + Send +
Sync>>>,
+ /// Maps each logical `Subquery` to its index in `subquery_results`.
+ /// Populated by the physical planner before calling
`create_physical_expr`.
+ pub subquery_indexes: HashMap<crate::logical_plan::Subquery, usize>,
Review Comment:
I took a brief look at doing this and it seems doable but not trivial; I
filed https://github.com/apache/datafusion/issues/21619 to track this, but I
think it's out of the scope of this PR.
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