support temporary_table route variable

src/obproxy/proxy/mysqllib/ob_session_field_mgr.h

@@ -504,7 +504,8 @@ public:
   static bool is_hot_modified_variable(const common::ObString &var_name);
   static bool is_last_insert_id_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_LAST_INSERT_ID; }
   static bool is_user_privilege_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_PROXY_USER_PRIVILEGE; }
-  static bool is_set_trx_executed_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_PROXY_SET_TRX_EXECUTED; }
+  static bool is_set_trx_executed_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_PROXY_SET_TRX_EXECUTED
+                                                                                   || var_name == sql::OB_SV_PROXY_SESSION_TEMPORARY_TABLE_USED; }
   static bool is_partition_hit_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_PROXY_PARTITION_HIT; }
   static bool is_global_version_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_PROXY_GLOBAL_VARIABLES_VERSION; }
   static bool is_capability_flag_variable(const common::ObString &var_name) { return var_name == sql::OB_SV_CAPABILITY_FLAG; }

src/sql/session/ob_system_variable_alias.h

@@ -74,6 +74,7 @@ namespace sql
   static const char* const OB_SV_ENABLE_PLAN_CACHE = "ob_enable_plan_cache";
   static const char* const OB_SV_ENABLE_INDEX_DIRECT_SELECT = "ob_enable_index_direct_select";
   static const char* const OB_SV_PROXY_SET_TRX_EXECUTED = "ob_proxy_set_trx_executed";
+  static const char* const OB_SV_PROXY_SESSION_TEMPORARY_TABLE_USED = "_ob_proxy_session_temporary_table_used";
   static const char* const OB_SV_ENABLE_AGGREGATION_PUSHDOWN = "ob_enable_aggregation_pushdown";
   static const char* const OB_SV_LAST_SCHEMA_VERSION = "ob_last_schema_version";
   static const char* const OB_SV_GLOBAL_DEBUG_SYNC = "ob_global_debug_sync";