各位大佬好： 在使用flink1.11 sql客户端的时候，只能只用最基本的count，group by、order by、join等都无法实现，请问这个是什么原因呢，感谢！
Flink SQL> select count(t2.superid) from cdp_profile_union t1 inner join cdp_crowd_10002 t2 on t1.superid=t2.superid; [ERROR] Could not execute SQL statement. Reason: org.apache.flink.table.api.ValidationException: SQL validation failed. null Flink SQL> select superid from cdp_profile_union group by superid; [ERROR] Could not execute SQL statement. Reason: org.apache.flink.table.api.ValidationException: SQL validation failed. null
