fix: push_down_filter optimization pass can push a IN(<subquery>) into a TableScan's filter clause

Author: wiedld

datafusion/expr/src/logical_plan/invariants.rs

@@ -210,12 +210,13 @@ pub fn check_subquery_expr(
         match outer_plan {
             LogicalPlan::Projection(_)
             | LogicalPlan::Filter(_)
+            | LogicalPlan::TableScan(_)
             | LogicalPlan::Window(_)
             | LogicalPlan::Aggregate(_)
             | LogicalPlan::Join(_) => Ok(()),
             _ => plan_err!(
                 "In/Exist subquery can only be used in \
-                Projection, Filter, Window functions, Aggregate and Join plan nodes, \
+                Projection, Filter, TableScan, Window functions, Aggregate and Join plan nodes, \
                 but was used in [{}]",
                 outer_plan.display()
             ),

datafusion/sqllogictest/test_files/subquery.slt

@@ -438,7 +438,7 @@ SELECT t1_id, t1_name, t1_int, (select t2_id, t2_name FROM t2 WHERE t2.t2_id = t
 
 #subquery_not_allowed
 #In/Exist Subquery is not allowed in ORDER BY clause.
-statement error DataFusion error: check_analyzed_plan\ncaused by\nError during planning: In/Exist subquery can only be used in Projection, Filter, Window functions, Aggregate and Join plan nodes, but was used in \[Sort: t1.t1_int IN \(<subquery>\) ASC NULLS LAST\]
+statement error DataFusion error: check_analyzed_plan\ncaused by\nError during planning: In/Exist subquery can only be used in Projection, Filter, TableScan, Window functions, Aggregate and Join plan nodes, but was used in \[Sort: t1.t1_int IN \(<subquery>\) ASC NULLS LAST\]
 SELECT t1_id, t1_name, t1_int FROM t1 order by t1_int in (SELECT t2_int FROM t2 WHERE t1.t1_id > t1.t1_int)
 
 #non_aggregated_correlated_scalar_subquery