Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22408
My general idea is to avoid risky implicit type casting at the beginning.
We can relax it in the future, if needed. After all, users can manually cast
the types after seeing the reasonable error message. This should not be a big
deal. However, returning a confusing result due to implicit type casting is not
good in general.
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