Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12081#issuecomment-208107091
Accidentally, deleted the previous post.
```
== Parsed Logical Plan ==
'Project [unresolvedalias('current_database(), None)]
+- OneRowRelation$
== Analyzed Logical Plan ==
current_database(): string
Project
[HiveGenericUDF#org.apache.hadoop.hive.ql.udf.generic.UDFCurrentDB() AS
current_database()#72979]
+- OneRowRelation$
== Optimized Logical Plan ==
Project [default AS current_database()#72979]
+- OneRowRelation$
== Physical Plan ==
WholeStageCodegen
: +- Project [default AS current_database()#72979]
: +- INPUT
+- Scan OneRowRelation[]
```
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