Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/4685#issuecomment-83823596
@kai-zeng in `HiveTypeCoercion`, there are lots of rules to
guarantee/produce the correct data type for the built-in expressions like here.
I mean, instead of adding check here, can we just keep updating/adding the
rules in `HiveTypeCoercion`? As in most of cases, what people need is the
correct casting, not throwing exception right?
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