In FusionInsight HD, regarding the secondary development of Hive UDF, which of the following descriptions is correct? (multiple choice)
A . Before the user-defined UDF is used, it needs to be created in the Hive system.
B . User-defined UDF is not allowed to add information such as summary and status.
C . User-defined UDF can add deterministic and statefull annotations according to the actual situation.
D . In a secure cluster, user-defined UDFs are recommended to be created before each use.
Answer: AC
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