Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14036
@rxin , the `/` in hive/mysql means fraction division, e.g. `3 / 2` will
get `1.5`. And the `div` is a special operator for integral division, `3 div 2`
will get `1`.
In spark sql we implement `div` by casting the result of `/` to int, which
is inefficient.
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