beliefer opened a new pull request #30023:
URL: https://github.com/apache/spark/pull/30023
### What changes were proposed in this pull request?
The current `Lead`/`Lag` extends `OffsetWindowFunction`.
`OffsetWindowFunction` contains field `direction` and use `direction` to
calculates the `boundary`.
We can use single literal expression unify the two properties.
For example:
3 means `direction` is Asc and `boundary` is 3.
-3 means `direction` is Desc and `boundary` is -3.
### Why are the changes needed?
Improve the current implement of `Lead`/`Lag`.
### Does this PR introduce _any_ user-facing change?
'No'.
### How was this patch tested?
Jenkins test.
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