diff --git a/src/frontend/src/optimizer/plan_expr_rewriter/const_case_when_rewriter.rs b/src/frontend/src/optimizer/plan_expr_rewriter/const_case_when_rewriter.rs
index a4970e7036c50..6a89a683f0e75 100644
--- a/src/frontend/src/optimizer/plan_expr_rewriter/const_case_when_rewriter.rs
+++ b/src/frontend/src/optimizer/plan_expr_rewriter/const_case_when_rewriter.rs
@@ -29,6 +29,6 @@ impl ExprRewriter for ConstCaseWhenRewriter {
             // Normal constant lookup pass
             return func_call.into();
         }
-        func_call.inputs()[0].clone().into()
+        func_call.inputs()[0].clone()
     }
 }