adriangb opened a new pull request, #18435:
URL: https://github.com/apache/datafusion/pull/18435

   ## Summary
   
   Validates and tests struct array support in InList expressions for 
multi-column join optimizations. The core `StructArraySet` implementation comes 
from PR2; this PR adds comprehensive integration testing.
   
   ## Changes
   
   - Merged PR2 (InList storage infrastructure)
   - Added multi-column join scenario integration test
   - Validates struct array InList operations work for realistic use cases
   - Tests efficient hash-based lookup with composite keys
   
   ## Value
   
   - Confirms struct array support is fully functional
   - Demonstrates the intended use case for multi-column join optimization
   - Validates O(1) hash-based lookup performance
   
   ## Testing
   
   - ✅ All clippy checks pass with `-D warnings`
   - ✅ 1427 physical-expr tests passing
   - ✅ New test: `test_struct_in_list_multi_column_join_scenario`
   
   ## Part of Multi-PR Strategy
   
   This is **PR3 of 7** in the InList pushdown feature breakdown.
   
   **Tier**: Capabilities (Tier 2)
   **Dependencies**: PR2 (InList storage)
   **Can merge**: After PR2 merges


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