fix(interactive): throw unsupported error when query PathExpand() w…

…ithin subtask (#3133)

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## What do these changes do?

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Currently, throw unsupported error when query `PathExpand()` (which is
implemented by `Iterate`) within subtask in physical plan in GIE.

Once Pegasus supports `Apply` with `Iterate` in subtask, this can be
removed.

## Related issue number

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change? -->

#3132

interactive_engine/executor/ir/core/src/plan/physical.rs

@@ -616,6 +616,17 @@ impl AsPhysical for LogicalPlan {
             if let Some(Apply(apply_opr)) = curr_node.borrow().opr.opr.as_ref() {
                 let mut sub_bldr = PlanBuilder::default();
                 if let Some(subplan) = self.extract_subplan(curr_node.clone()) {
+                    for (_, node) in &subplan.nodes {
+                        let operator = node.borrow().opr.clone();
+                        match operator.opr.as_ref() {
+                            // TODO(bingqing): remove this when engine supports.
+                            Some(pb::logical_plan::operator::Opr::Path(_)) => {
+                                Err(IrError::Unsupported("PathExpand in Apply".to_string()))?
+                            }
+                            _ => {}
+                        }
+                    }
+
                     let mut expand_degree_opt = None;
                     if subplan.len() <= 2 {
                         if subplan.len() == 1 {