dongjoon-hyun opened a new pull request, #406:
URL: https://github.com/apache/spark-connect-swift/pull/406
### What changes were proposed in this pull request?
This PR adds the `DataFrameNaFunctions` API (via `DataFrame.na`), mirroring
PySpark's `df.na.fill/drop/replace` and wiring the existing `NAFill`,
`NADrop`,
and `NAReplace` Spark Connect messages into the Swift client.
- `fill`, `drop`, `replace` on `DataFrame.na`
- `getNAFill`, `getNADrop`, `getNAReplace` plan builders in
`SparkConnectClient`
### Why are the changes needed?
To reach feature parity with PySpark/Spark SQL for handling missing data.
### Does this PR introduce _any_ user-facing change?
Yes, this adds new public APIs.
```swift
try await df.na.fill(0).show()
try await df.na.drop().show()
try await df.na.replace("s", ["a": "z"]).show()
```
### How was this patch tested?
Pass the CI build.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Claude Opus 4.8)
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