Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/6981#issuecomment-119804966
@tarekauel do you want to reopen this now we have defined the semantics of
date functions?
Also take a look at how Hive implements these functions:
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/VectorUDFYearLong.java#L37
It basically pre-computes the values and then just return the right year.
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