GreenPlum 提取数据表信息

参考：

https://www.alberton.info/postgresql_meta_info.html

https://my.oschina.net/Kenyon/blog/226600

列信息:
greenplum: https://www.alberton.info/postgresql_meta_info.html

系统表：
greenplum: https://blog.csdn.net/tao_wei162/article/details/84826695

版本号：SELECT VERSION();

视图：
greenplum:      https://dba.stackexchange.com/questions/23836/how-to-list-all-views-in-sql-in-postgresql

连接：
greenplum: https://blog.csdn.net/enterings/article/details/78348322
greenplum jar: https://mvnrepository.com/artifact/com.pivotal/greenplum-jdbc/5.1.4

存储过程：
 https://www.chrisnewland.com/postgres-list-user-defined-stored-procedures-77
https://gpdb.docs.pivotal.io/580/ref_guide/sql_commands/sql_ref.html
https://www.digitalocean.com/community/tutorials/how-to-create-data-queries-in-postgresql-by-using-the-select-command