Add tx snapshot for 4377 check in index lookup.

src/sql/das/ob_das_scan_op.cpp

@@ -1130,6 +1130,7 @@ int ObLocalIndexLookupOp::check_lookup_row_cnt()
                       "lookup_group_cnt", get_lookup_group_cnt(),
                       "index_table_id", index_ctdef_->ref_table_id_ ,
                       "data_table_tablet_id", tablet_id_ ,
+                      KPC_(snapshot),
                       KPC_(tx_desc));
       if (trans_info_array_.count() == scan_param_.key_ranges_.count()) {
         for (int64_t i = 0; i < trans_info_array_.count(); i++) {

src/sql/engine/table/ob_table_scan_op.cpp

@@ -3354,6 +3354,7 @@ int ObGlobalIndexLookupOpImpl::check_lookup_row_cnt()
                 "index_group_cnt", get_index_group_cnt(),
                 "lookup_group_cnt", get_lookup_group_cnt(),
                 "index_table_id", table_scan_op_->get_tsc_spec().get_ref_table_id(),
+                K(DAS_CTX(table_scan_op_->get_exec_ctx()).get_snapshot()),
                 KPC(my_session->get_tx_desc()));
       //now to dump lookup das task info
       int64_t rownum = 0;