openGauss5.1插件参考：ndpplugin 查看视图
ndpplugin视图用于查看查询语句下推详细统计信息，帮助用户判断语句下推情况。
openGauss=# select * from pushdown_statics();
query | total_pushdown_page | back_to_gauss | received_scan | received_agg | failed_backend_handle | failed_sendback
-------+---------------------+---------------+---------------+--------------+-----------------------+-----------------
0 | 0 | 0 | 0 | 0 | 0 | 0
(1 row)
