Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12081#issuecomment-208108264
No clue... In my local environment, it is not using Hive's UDF.
```
== Parsed Logical Plan ==
'Project [unresolvedalias('current_database(), None)]
+- OneRowRelation$
== Analyzed Logical Plan ==
currentdatabase(): string
Project [currentdatabase(org.apache.spark.sql.hive.test.TestHive$@62de70e2)
AS currentdatabase()#5]
+- OneRowRelation$
== Optimized Logical Plan ==
Project [default AS currentdatabase()#5]
+- OneRowRelation$
== Physical Plan ==
WholeStageCodegen
: +- Project [default AS currentdatabase()#5]
: +- INPUT
+- Scan OneRowRelation[]
```
Will continue the investigation.
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