【HAWQ】oracle兼容函数orafunc

参考 https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/ABS.html#GUID-D8D3489A-44EA-4FEC-A6F0-B5E312FFC231 测试的软件版本 PostgreSQL 8.2.15 (OushuDB 3.4.0.0) (Apache HAWQ 2.4.0.0) (Greenplum Database 4.2.0 build 1) on x86_64-unknown-linux-gnu,...