1. 如果是源码安装，需要进入源码的contib目录，进行make；make install
  2. CREATE EXTENSION postgres_fdw;
  3. CREATE SERVER gp_server FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host ‘10.20.100.60’, dbname ‘test’, port ‘5432’);其中，host为greenplum的master IP地址
  4. CREATE USER MAPPING FOR public SERVER gp_server OPTIONS (user ‘gpadmin’, password ‘’); 填入greenplum的用户名密码
  5. create foreign table test_forergn( “id” int ,“lo” double precision , “pt” timestamp without time zone , “name” text) server gp_server OPTIONS (schema_name ‘public’, table_name ‘test_gp’); 其中options中的table_name即为greenplum中的表名