Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18986
@stanzhai Implicit type casting has to follow some rules. If you think this
is a bug, could you do a complete investigation about this issue? For example,
how Hive handles the type promotion?
If needed, we can consider supporting different type promotion/casting
modes. (e.g., one is Hive compatible)
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