fix: fix wrong merge conflict

Author: zhuliquan

datafusion/proto/src/physical_plan/to_proto.rs

@@ -23,7 +23,7 @@ use datafusion::physical_expr::window::{SlidingAggregateWindowExpr, StandardWind
 use datafusion::physical_expr::{LexOrdering, PhysicalSortExpr, ScalarFunctionExpr};
 use datafusion::physical_plan::expressions::{
     BinaryExpr, CaseExpr, CastExpr, Column, InListExpr, IsNotNullExpr, IsNullExpr,
-    Literal, NegativeExpr, NotExpr, NthValue, ScalarRegexMatchExpr, TryCastExpr, UnKnownColumn,
+    Literal, NegativeExpr, NotExpr, ScalarRegexMatchExpr, TryCastExpr, UnKnownColumn,
 };
 use datafusion::physical_plan::udaf::AggregateFunctionExpr;
 use datafusion::physical_plan::windows::{PlainAggregateWindowExpr, WindowUDFExpr};