greenplumn regression 代码
文件路径：/src/interfaces/ecpg/test/regression.h
exec sql define REGRESSDB1 ecpg1_regression;
exec sql define REGRESSDB2 ecpg2_regression;
exec sql define REGRESSUSER1 regress_ecpg_user1;
exec sql define REGRESSUSER2 regress_ecpg_user2;