集群层sql和下发到节点层的sql，如何对应？
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下发到节点层的sql中的注释信息包含集群层sql的id信息。
例如：
在集群层执行select * from lineorder;，下发节点gc层show processlist信息如下，sql id是102。
[root@pst-red214 ~]# gccli
GBase client 8.6.1.1-16.28.81413. Copyright (c) 2004-2017, GBase. All Rights Reserved.
gbase> show processlist;
+-----+-----------------+-----------------+------+---------+-------+-----------------------------+-------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+-----------------+-----------------+------+---------+-------+-----------------------------+-------------------------+
| 1 | event_scheduler | localhost | NULL | Daemon | 15044 | Waiting for next activation | NULL |
| 52 | root | 127.0.0.1:38654 | NULL | Sleep | 3414 | | NULL |
| 101 | root | 127.0.0.1:38820 | NULL | Query | 0 | NULL | show processlist |
| 102 | root | 127.0.0.1:38822 | guo | Query | 3 | Sending task to gnodes | select * from lineorder |
+-----+-----------------+-----------------+------+---------+-------+-----------------------------+-------------------------+
4 rows in set (Elapsed: 00:00:00.00)
gn层show processlist如下，下发的sql中SELECT /*192.168.105.214_102_1_2017-07-03_14:28:29*/ /*+ TID('6561') */，包含集群层sql的id 102。
[root@pst-red214 ~]# gncli
GBase client 8.6.1.1-16.28.81413. Copyright (c) 2004-2017, GBase. All Rights Reserved.
gbase> show processlist;
+-----+-------+-----------------------+---------+---------+------+--------------+------------------------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+-------+-----------------------+---------+---------+------+--------------+------------------------------------------------------------------------------------------------------+
| 539 | gbase | 192.168.105.212:10034 | gctmpdb | Sleep | 9962 | NULL | NULL |
| 630 | root | 127.0.0.1:61898 | NULL | Query | 0 | NULL | show processlist |
| 631 | root | 192.168.105.214:57013 | gctmpdb | Query | 6 | Sending data | SELECT /*192.168.105.214_102_1_2017-07-03_14:28:29*/ /*+ TID('6561') */ `guo.lineorder`.`lo_orderkey |
+-----+-------+-----------------------+---------+---------+------+--------------+------------------------------------------------------------------------------------------------------+
3 rows in set (Elapsed: 00:00:00.00)