Jiaan Geng created SPARK-45649:
----------------------------------
Summary: Unified the prepare framework for
`OffsetWindowFunctionFrame`
Key: SPARK-45649
URL: https://issues.apache.org/jira/browse/SPARK-45649
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.0.0
Reporter: Jiaan Geng
Assignee: Jiaan Geng
Currently, the implementation 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 {
...
}
}
}
```
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