a620a2a7e5
### What changes were proposed in this pull request?
This proposes a minor refactoring to match `NestedColumnAliasing` to `GeneratorNestedColumnAliasing` so it returns the pruned plan directly.
```scala
case p NestedColumnAliasing(nestedFieldToAlias, attrToAliases) =>
NestedColumnAliasing.replaceToAliases(p, nestedFieldToAlias, attrToAliases)
```
vs
```scala
case GeneratorNestedColumnAliasing(p) => p
```
### Why are the changes needed?
Just for readability.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing tests should cover.
Closes #28812 from HyukjinKwon/SPARK-31977.
Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
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