sunchao opened a new pull request #29775:
URL: https://github.com/apache/spark/pull/29775
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### What changes were proposed in this pull request?
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This is a follow-up on #29565, and addresses a few issues in the last PR:
- style issue pointed by [this
comment](https://github.com/apache/spark/pull/29565#discussion_r487646749)
- skip optimization when `fromExp` is foldable (by [this
comment](https://github.com/apache/spark/pull/29565#discussion_r487646973)) as
there could be more efficient rule to apply for this case.
- pass timezone info to the generated cast on the literal value
- a bunch of cleanups and test improvements
Originally I plan to handle this when implementing
[SPARK-32858](https://issues.apache.org/jira/browse/SPARK-32858) but now think
it's better to isolate these changes from that.
### Why are the changes needed?
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To fix a few left over issues in the above PR.
### Does this PR introduce _any_ user-facing change?
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No
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Added a test for the foldable case. Otherwise relying on existing tests.
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