[BUGFIX] fix lob bugs

src/observer/mysql/ob_query_driver.cpp

@@ -528,7 +528,20 @@ int ObQueryDriver::process_lob_locator_results(ObObj& value,
     ObLobLocatorV2 loc(value.get_string(), value.has_lob_header());
     if (loc.is_lob_locator_v1()) {// do nothing, lob locator version 1
     } else if (loc.is_valid()) { // lob locator v2
-      if (!loc.has_extern()) {
+      if (!loc.has_lob_header()) {
+        ObString data = value.get_string();
+        ObTextStringResult new_tmp_lob(value.get_type(), true, allocator);
+        if (OB_FAIL(new_tmp_lob.init(data.length()))) {
+          LOG_WARN("fail to init text string result", K(ret), K(new_tmp_lob), K(data.length()));
+        } else if (OB_FAIL(new_tmp_lob.append(data))) {
+          LOG_WARN("fail to append data", K(ret), K(new_tmp_lob), K(data.length()));
+        } else {
+          ObString res;
+          new_tmp_lob.get_result_buffer(res);
+          value.set_lob_value(value.get_type(), res.ptr(), res.length());
+          value.set_has_lob_header(); // must has lob header
+        }
+      } else if (!loc.has_extern()) {
         // currently all temp lobs have extern field in oracle mode
         // or the lob locator header cannot compatable with clients for 4.0
         ret = OB_INVALID_ARGUMENT;
@@ -704,6 +717,8 @@ int ObQueryDriver::convert_text_value_charset(ObObj& value,
           // do nothing
         } else if (OB_FAIL(lob.get_inrow_data(inrow_data))) {
           LOG_WARN("fail to get inrow data", K(ret), K(lob));
+        } else if (inrow_data.length() == 0) {
+          // do nothing
         } else {
           int64_t lob_data_byte_len = inrow_data.length();
           int64_t offset_len = reinterpret_cast<uint64_t>(inrow_data.ptr()) - reinterpret_cast<uint64_t>(lob.ptr_);

src/share/ob_lob_access_utils.cpp

@@ -1019,7 +1019,7 @@ int ObTextStringResult::calc_buffer_len(int64_t res_len)
       res_len += sizeof(ObLobCommon);
       buff_len_ = ObLobLocatorV2::calc_locator_full_len(extern_flags, 0, static_cast<uint32_t>(res_len), false);
     } else {
-      ret = OB_SIZE_OVERFLOW;
+      ret = OB_NOT_SUPPORTED;
       LOG_WARN("Lob: out row temp lob not implemented, not support length bigger than 512M",
         K(ret), K(this), K(pos_), K(buff_len_), K(res_len));
     }

src/sql/engine/expr/ob_expr_output_pack.cpp

@@ -340,6 +340,8 @@ int ObExprOutputPack::convert_text_value_charset(common::ObObj& value,
           // do nothing
         } else if (OB_FAIL(lob.get_inrow_data(inrow_data))) {
           LOG_WARN("fail to get inrow data", K(ret), K(lob));
+        } else if (inrow_data.length() == 0) {
+          // do nothing
         } else {
           int64_t lob_data_byte_len = inrow_data.length();
           int64_t offset_len = reinterpret_cast<uint64_t>(inrow_data.ptr()) - reinterpret_cast<uint64_t>(lob.ptr_);
@@ -494,12 +496,24 @@ int ObExprOutputPack::process_lob_locator_results(common::ObObj& value,
     ObLobLocatorV2 loc(value.get_string(), value.has_lob_header());
     if (loc.is_lob_locator_v1()) { // do nothing, lob locator version 1
     } else if (loc.is_valid()) { // lob locator v2
-      if (!loc.has_extern()) { // if has header but without extern header
+      if (!loc.has_lob_header()) { // consider 4.0 will return no lob header obj
+        ObString data = value.get_string();
+        ObTextStringResult new_tmp_lob(value.get_type(), true, &alloc);
+        if (OB_FAIL(new_tmp_lob.init(data.length()))) {
+          LOG_WARN("fail to init text string result", K(ret), K(new_tmp_lob), K(data.length()));
+        } else if (OB_FAIL(new_tmp_lob.append(data))) {
+          LOG_WARN("fail to append data", K(ret), K(new_tmp_lob), K(data.length()));
+        } else {
+          ObString res;
+          new_tmp_lob.get_result_buffer(res);
+          value.set_lob_value(value.get_type(), res.ptr(), res.length());
+          value.set_has_lob_header(); // must has lob header
+        }
+      } else if (!loc.has_extern()) { // if has header but without extern header
         // mock loc v2 with extern ? currently all temp lobs have extern field in oracle mode
         // should not come here
         OB_ASSERT(0);
-      }
-      if (!is_support_outrow_locator_v2 && !loc.has_inrow_data()) {
+      } else if (!is_support_outrow_locator_v2 && !loc.has_inrow_data()) {
         if (OB_FAIL(ObTextStringIter::append_outrow_lob_fulldata(value, &my_session, alloc))) {
           LOG_WARN("Lob: convert lob to outrow failed", K(value), K(GET_MIN_CLUSTER_VERSION()));
         }

src/storage/lob/ob_lob_manager.cpp

@@ -420,7 +420,8 @@ int ObLobManager::is_remote(ObLobAccessParam& param, bool& is_remote, common::Ob
     } else {
       is_remote = (dst_addr != self_addr);
       if (param.from_rpc_ == true && is_remote) {
-        LOG_WARN("call from rpc, but remote again", K(dst_addr), K(self_addr));
+        ret = OB_NOT_MASTER;
+        LOG_WARN("call from rpc, but remote again", K(ret), K(dst_addr), K(self_addr));
       }
     }
   }