Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15880
Below contains a section of `Implicit Data Conversion` in Oracle:
https://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements002.htm
It clearly documents the potential changes in implicit conversion and
encourage users to do explicit casting.
> Algorithms for implicit conversion are subject to change across software
releases and among Oracle products. Behavior of explicit conversions is more
predictable.
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