beliefer opened a new pull request, #43507:
URL: https://github.com/apache/spark/pull/43507
### What changes were proposed in this pull request?
Currently, the implementation of the `prepare` of all the
`OffsetWindowFunctionFrame` have the same code logic show below.
```
override def prepare(rows: ExternalAppendOnlyUnsafeRowArray): Unit = {
if (offset > rows.length) {
fillDefaultValue(EmptyRow)
} else {
resetStates(rows)
if (ignoreNulls) {
...
} else {
...
}
}
}
```
This PR want unify the prepare framework for `OffsetWindowFunctionFrame`
### Why are the changes needed?
Unify the prepare framework for `OffsetWindowFunctionFrame`
### Does this PR introduce _any_ user-facing change?
'No'.
Inner update.
### How was this patch tested?
Exists test cases.
### Was this patch authored or co-authored using generative AI tooling?
'No'.
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