Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16476
It seems MySQL do need all arguments in `FIELD` have same type(or can be
converted to same type):
http://www.w3resource.com/mysql/string-functions/mysql-field-function.php
I think this is more reasonable, we don't have to follow hive strictly, can
you check more database and see what's the most common way to evalaute `FIELD`?
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