dongjoon-hyun opened a new pull request, #454:
URL: https://github.com/apache/spark-connect-swift/pull/454
### What changes were proposed in this pull request?
This PR aims to support `pivot` in `GroupedData`.
```swift
let df2 = try await df.groupBy("year")
.pivot("course", ["dotNET", "Java"])
.agg("sum(earnings)")
```
If `values` is not given, the server computes the distinct values of the
pivot
column. Like the Scala client, `pivot` is only allowed after `groupBy` and
throws `SparkConnectError.UnsupportedOperation` otherwise.
### Why are the changes needed?
To support the standard `pivot` API like the Scala and Python clients.
### Does this PR introduce _any_ user-facing change?
No, this is a new API.
### How was this patch tested?
Pass the CIs with newly added test cases.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Fable 5
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