diff --git a/src/sql/engine/expr/ob_expr_udf.cpp b/src/sql/engine/expr/ob_expr_udf.cpp
index 5f22413d68..7a82f03499 100644
--- a/src/sql/engine/expr/ob_expr_udf.cpp
+++ b/src/sql/engine/expr/ob_expr_udf.cpp
@@ -600,6 +600,10 @@ int ObExprUDF::eval_udf(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
                               ctx.exec_ctx_.get_allocator(), res));
       }
       OZ(expr.deep_copy_datum(ctx, res));
+
+      if (OB_SUCC(ret) && info->is_udt_cons_) {
+        OZ (pl::ObUserDefinedType::destruct_obj(udf_params->at(0), ctx.exec_ctx_.get_my_session()));
+      }
     }
     if (need_end_stmt) {
       session->set_end_stmt();