andygrove commented on code in PR #3754:
URL: https://github.com/apache/arrow-datafusion/pull/3754#discussion_r990631919


##########
datafusion/optimizer/src/scalar_subquery_to_join.rs:
##########
@@ -21,7 +21,7 @@ use crate::utils::{
 };
 use crate::{utils, OptimizerConfig, OptimizerRule};
 use datafusion_common::{context, plan_err, Column, Result};
-use datafusion_expr::logical_plan::{Aggregate, Filter, JoinType, Projection, 
Subquery};
+use datafusion_expr::logical_plan::{Filter, JoinType, Limit, Subquery};
 use datafusion_expr::{combine_filters, Expr, LogicalPlan, LogicalPlanBuilder, 
Operator};

Review Comment:
   > The idea here is that if the particular subquery isn't supported by the 
physical operators, it will error out at that time?
   
   Yes, exactly. 



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