Fix enumset cast to time in static typing engine

src/sql/engine/expr/ob_expr_cast.cpp

@@ -368,7 +368,19 @@ int ObExprCast::calc_result_type2(
         OZ(ObRawExprUtils::setup_extra_cast_utf8_type(dst_type, dst_type_utf8));
         OX(type1.set_calc_meta(dst_type_utf8.get_obj_meta()));
       } else {
-        type1.set_calc_meta(type1.get_obj_meta());
+        bool need_warp = false;
+        if (ob_is_enumset_tc(type1.get_type())) {
+          // For enum/set type, need to check whether warp to string is required.
+          if (OB_FAIL(ObRawExprUtils::need_wrap_to_string(type1.get_type(), type1.get_calc_type(), false, need_warp))) {
+            LOG_WARN("need_wrap_to_string failed", K(ret), K(type1));
+          }
+        } else if (OB_LIKELY(need_warp)) {
+          // need_warp is true, no-op and keep type1's calc_type is dst_type. It will be wrapped
+          // to string in ObRawExprWrapEnumSet::visit(ObSysFunRawExpr &expr) later.
+        } else {
+          // need_warp is false, set calc_type to type1 itself.
+          type1.set_calc_meta(type1.get_obj_meta());
+        }
       }
     } else {
       // no need to set cast mode, already setup while deduce type.

src/sql/resolver/expr/ob_raw_expr_wrap_enum_set.cpp

@@ -721,6 +721,7 @@ int ObRawExprWrapEnumSet::visit(ObSysFunRawExpr& expr)
         } else if (ob_is_enumset_tc(param_expr->get_data_type())) {
           ObObjType calc_type = expr.get_input_types().at(i).get_calc_type();
           ObSysFunRawExpr* wrapped_expr = NULL;
+          // Enumset warp to string in CAST expr will be handled here.
           if (OB_FAIL(wrap_type_to_str_if_necessary(
                   param_expr, calc_type, get_current_level(), is_same_need, wrapped_expr))) {
             LOG_WARN("failed to wrap_type_to_str_if_necessary", K(i), K(expr), K(ret));