andygrove opened a new pull request, #3214:
URL: https://github.com/apache/datafusion-comet/pull/3214
## Summary
- Enables support for complex types (arrays, maps, structs) in Comet's
native Parquet writer
- Removes the blocking check that previously prevented complex types
- Adds comprehensive test coverage for complex types
## Changes
- Remove complex type blocking check in `CometDataWritingCommand.scala`
- Add 12 new tests for complex types in `CometParquetWriterSuite.scala`:
- Basic complex types (array, struct, map)
- Nested complex types (array of structs, struct containing array, map
with struct values, deeply nested)
- Nullable complex types with nulls at various nesting levels
- Complex types containing decimal and temporal types
- Empty arrays and maps
- Fuzz testing with randomly generated complex type schemas
- Update documentation to reflect complex type support
## Test plan
- [x] All 15 tests in `CometParquetWriterSuite` pass
- [x] Tests verify round-trip compatibility (write with Comet, read with
Spark/Comet)
- [x] Fuzz testing with randomly generated schemas
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