Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5538#issuecomment-94640080
@DoingDone9 thanks for the explanation. In thericially, applying the
`Optimizer` rule is optional, and probably not everyone understand how the
constant folding works. But another option: we can subsitute the
`current_database` with Literal(xxx. StringType) in `HiveFunctionRegstry`, so
we can remove the `sqlUDFCurrentDB`, what do you think?
@marmbrus any idea?
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