Github user DoingDone9 commented on the pull request:
https://github.com/apache/spark/pull/5538#issuecomment-94635160
@chenghao-intel your idea is good but âselect current_databaseâ is
syntax of hive. and i want to implemente it . And this UDF do not run within
executor(s),because this udf expression is foldable, then it will be computed
in ConstantFolding of Optimizer.So will get the name of currentDB after
optimizer not after execution.
```
== Analyzed Logical Plan ==
Project [HiveGenericUdf#org.apache.spark.sql.hive.sqlUDFCurrentDB() AS
_c0#59]
NoRelation$
== Optimized Logical Plan ==
Project [default AS _c0#59]
NoRelation$
```
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