[Community] oracle_fdw 连接oracle问题

尝试用 oracle_fdw 连接oracle， opengauss版本是5.0.0，执行create user mapping时有个报错： openGauss=# create extension oracle_fdw; CREATE EXTENSION openGauss=# create server oracle_test foreign data wrapper oracle_fdw options(dbserver 'paastest/Paas1015@172.32.150.13:1521/nlpass01'); CREATE SERVER openGauss=# create user mapping for postgres server oracle_test options (user 'paastest', password 'Paas1015'); ERROR: No key file usermapping.key.cipher HINT: Please create usermapping.key.cipher file with gs_guc and gs_ssh, such as :gs_ssh -c "gs_guc generate -S XXX -D $GAUSSHOME/bin -o usermapping" openGauss=# openGauss=# openGauss=# 看不懂是什么意思，文档里也没找到，也没有相关例子，请问这种情况是要求怎样配置？