dongjoon-hyun opened a new pull request, #506:
URL: https://github.com/apache/spark-connect-swift/pull/506

   ### What changes were proposed in this pull request?
   
   This PR removes the force casts (`as!`) from `DataFrame.collect()` and 
`DataFrame.show(_:_:_:)`.
   
   - Per-value casts (`int64`, `date32`) use `as?`, like their sibling branches.
   - Per-column casts (`ArrowTypeTime64`, `ArrowTypeTimestamp`, `AsString` for 
`binary`/`struct`) throw `SparkConnectError.invalidArrowData`.
   - `show(_:_:_:)` folds the `String` cast into its existing `guard`.
   
   ### Why are the changes needed?
   
   A force cast traps and kills the process. Since these casts apply to Arrow 
data received from a server, unexpected data crashes the host application. Both 
methods already `throws`, so callers can handle the error instead.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, only where it previously crashed: `int64`/`date32` cells become `nil`, 
and the other cases throw `SparkConnectError.invalidArrowData`. No change for 
valid Arrow data.
   
   ### How was this patch tested?
   
   Pass the CIs and manual tests with `apache/spark:4.2.0` Spark Connect server.
   
   ```
   swift build -c release
   swift test --no-parallel -c release --filter 
"DataFrameTests|RowTests|CreateDataFrameTests|DataTypeTests"
   ```
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Opus 5


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