zhangbutao commented on PR #4786:
URL: https://github.com/apache/hive/pull/4786#issuecomment-1868192640

   @ayushtkn My bad. If a hive cluster has no any udf functions, the direct sql 
will faill in case of empty functionIds.
   `SELECT "FUNCS"."FUNC_ID", "FUNCS"."FUNC_NAME", "DBS"."NAME", 
"FUNCS"."CLASS_NAME", "FUNCS"."OWNER_NAME", "FUNCS"."OWNER_TYPE", 
"FUNCS"."CREATE_TIME", "FUNCS"."FUNC_TYPE" FROM "FUNCS" LEFT JOIN "DBS" ON 
"FUNCS"."DB_ID" = "DBS"."DB_ID" where "FUNCS"."FUNC_ID" in () order by 
"FUNCS"."FUNC_NAME" asc;`
   
   Need to return early in case of empty functionIds to avoid the invalid 
direct sql. Like this:
   
https://github.com/apache/hive/blob/2d6e4a7ef4d9ed6ce997520e5fe3b6841ab5ee31/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MetaStoreDirectSql.java#L679-L683
   
   Submit a PR to fix this, please take a look. 
https://github.com/apache/hive/pull/4971
   Thanks.


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