yaooqinn opened a new pull request #28650:
URL: https://github.com/apache/spark/pull/28650
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### What changes were proposed in this pull request?
Currently, `date_format` and `from_unixtime` have different exception
handling behavior for formatting datetime values.
In this PR, we apply the exception handling behavior of `date_format` to
`from_unixtime`
### Why are the changes needed?
Consistency, and avoid silently data change to result in `null`.
### Does this PR introduce _any_ user-facing change?
Yes, invalid datetime patterns will fail `from_unixtime` instead of
resulting `NULL`
### How was this patch tested?
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add more tests
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