Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/20023
The problem found by this PR is just one of the issues that returns NULL
when SPARK SQL is unable to process it. Below is another example. I believe we
can find more.
```SQL
SELECT CAST('a' AS TIMESTAMP)
```
Before we deciding how to fix these issues (one by one or as a whole), we
need to do more investigation and identify all of them. We also need to clearly
document our current behaviors and then our users can know what is the result
they can expect.
Yeah! Please go ahead to create a new PR for adding more tests. Thanks!
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