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Major upgrade to DataFusion 52 with comprehensive UDF API migration. ## Breaking Changes - Migrated all UDFs from `invoke_batch` to `invoke_with_args` API - Updated function signatures to match DataFusion 52 requirements - Added DynEq and DynHash trait implementations for all UDF structs ## New Features - Created test_utils.rs helper module for UDF testing - Added StringViewArray support for all string operations - Enhanced type compatibility across all function implementations ## Technical Changes - Updated arrow imports to use datafusion::arrow namespace - Fixed aggregate and window function signatures (state_fields, field) - Migrated all 242 tests to new API with helper functions - Added UTF8View type support in executor, flatten, and window functions ## Testing - All 242 tests passing - Build successful - No breaking changes for end users Closes #XX
- Refactor extract_strings_from_array to use Option::map instead of manual if-else pattern - Inline format args in handlers.rs
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