Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/12036#issuecomment-203111573
@viirya I took a look at the existing code in `HiveFunctionRegistry` and I
think there's some cleanup we need to do before we can implement these DDLs. In
particular, temporary functions should not go through Hive (SPARK-14253).
Instead, we should just create a function builder ourselves every time we get
`CREATE TEMPORARY FUNCTION` and use that to call
`sessionState.catalog.createTempFunction`. This ensures all temporary
functions, even the ones extending Hive UDF classes, are maintained only in
Spark. THEN it will be much easier to implement the DDLs in a clean way.
I would recommend putting this task on hold in the mean time.
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