beliefer opened a new pull request #28551:
URL: https://github.com/apache/spark/pull/28551
### What changes were proposed in this pull request?
Some alias of expression can not display correctly in schema. This PR will
fix them.
- `ln`
- `rint`
- `lcase`
- `position`
### Why are the changes needed?
Improve the implement of some expression.
### Does this PR introduce _any_ user-facing change?
'Yes'. This PR will let user see the correct alias in schema.
### How was this patch tested?
Jenkins test.
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