我是使用yum安装的PostgreSQL,安装完成之后,发现安装plpythonu,执行下面的语句是保存
$ psql -d pgwatch2 -c "CREATE EXTENSION plpythonu;"
ERROR: could not open extension control file "/usr/pgsql-9.6/share/extension/plpythonu.control": No such file or directory
改如何重新安装plpythonu呢?