fix cast string to number overflow bug

src/share/object/ob_obj_cast.cpp

@@ -3681,7 +3681,7 @@ static int string_number(
       ret = value.from_sci_opt(str.ptr(), str.length(), params, &res_precision, &res_scale);
       // select cast('1e500' as decimal);  -> max_val
       // select cast('-1e500' as decimal); -> min_val
-      if (CM_IS_SET_MIN_IF_OVERFLOW(cast_mode) && ret == OB_NUMERIC_OVERFLOW) {
+      if (ret == OB_NUMERIC_OVERFLOW) {
         int64_t i = 0;
         while (i < str.length() && isspace(str[i])) {
           ++i;

src/sql/engine/expr/ob_datum_cast.cpp

@@ -844,7 +844,7 @@ static OB_INLINE int common_string_number(
     ret = nmb.from_sci_opt(in_str.ptr(), in_str.length(), alloc, &res_precision, &res_scale);
     // select cast('1e500' as decimal);  -> max_val
     // select cast('-1e500' as decimal); -> min_val
-    if (OB_NUMERIC_OVERFLOW == ret && CM_IS_SET_MIN_IF_OVERFLOW(expr.extra_)) {
+    if (OB_NUMERIC_OVERFLOW == ret) {
       int64_t i = 0;
       while (i < in_str.length() && isspace(in_str[i])) {
         ++i;