fix(tianmu): revert PR #1841. (#1850)

Due to the disk space flattion, this PR is used to revert PR #1841. But this will lead to data in-consistent after the
instance killed at randomly because the new data inserted into memory, and will lost. The root cause pls ref to discussion
in #1621.

storage/tianmu/vc/tianmu_attr.cpp

@@ -952,7 +952,7 @@ void TianmuAttr::LoadData(loader::ValueCache *nvs, Transaction *conn_info) {
   }
 
   DPN &dpn = get_dpn(pi);
-  if (current_txn_->LoadSource() == common::LoadSource::LS_Direct ||
+  if (/*current_txn_->LoadSource() == common::LoadSource::LS_Direct ||*/
       current_txn_->LoadSource() == common::LoadSource::LS_File || dpn.numOfRecords == (1U << pss)) {
     Pack *pack = get_pack(pi);
     if (!dpn.Trivial()) {