Github user aray commented on the issue:
https://github.com/apache/spark/pull/15898
The code that is being changed originated 2 years ago with the addition of
Hive 0.13 support by @zhzhan, see
https://github.com/apache/spark/commit/7c89a8f0c81ecf91dba34c1f44393f45845d438c#diff-77621c6c599cfdd24363967a500be1c5R109
Before that there was not even a null check.
I will add the test you are suggesting @HyukjinKwon
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