fix white scan code

deps/oblib/src/lib/mysqlclient/ob_mysql_result.h

@@ -537,7 +537,6 @@
     } else if (OB_ERR_NULL_VALUE == ret || OB_ERR_COLUMN_NOT_FOUND == ret) {                                     \
       ret = OB_SUCCESS;                                                                                          \
       real_length = 0;                                                                                           \
-      field[0] = '\0';                                                                                           \
     } else {                                                                                                     \
       SQL_LOG(WARN, "fail to extract strbuf field mysql. ", K(ret));                                             \
     }                                                                                                            \

src/share/backup/ob_physical_restore_table_operator.cpp

@@ -480,7 +480,6 @@ int ObPhysicalRestoreTableOperator::retrieve_restore_option(
     int64_t real_len = 0;  // not used
     EXTRACT_STRBUF_FIELD_MYSQL_SKIP_RET(result, "name", name, OB_INNER_TABLE_DEFAULT_KEY_LENTH, real_len);
     EXTRACT_LONGTEXT_FIELD_MYSQL_WITH_ALLOCATOR_SKIP_RET(result, "value", value, allocator, real_len);
-    LOG_DEBUG("retrieve restore option", K(ret), "name", name, "value", value);
 
 #define RETRIEVE_UINT_VALUE(COLUMN_NAME, OBJ)                                       \
   if (OB_SUCC(ret)) {                                                               \