Github user DoingDone9 commented on the pull request:
https://github.com/apache/spark/pull/4995#issuecomment-92599430
I do not agree that. Because this expression is foldable, then it will be
computed in ConstantFolding of Optimizer. So I will get the name of currentDB
after optimizer not after execution. like that
```
== Analyzed Logical Plan ==
Project [HiveGenericUdf#org.apache.spark.sql.hive.sqlUDFCurrentDB() AS
_c0#59]
NoRelation$
== Optimized Logical Plan ==
Project [default AS _c0#59]
NoRelation$
```
@marmbrus
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