Github user viirya commented on the issue:
https://github.com/apache/spark/pull/14259
Use the added test case as example, the generated java code to access the
second element in a Tuple2 `(false, null)` throws `NullPointerException`:
int value = isNull1? -1 : (Integer) obj._2();
To assign a null to int will cause `NullPointerException`. But `isNull1`
only checks if `obj` is null or not.
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