Column projection pushdown for GROUP BY

[poyrazK]

Summary

• Column projection pushdown: scan reads only required columns for GROUP BY queries
• Q1 GROUP BY: 161k -> 2.68M rows/s (16-17x speedup)
• Gap vs DuckDB closes from 385x to 21x (10k)

Commits

1. Add read_batch(col_indices) overload declaration to ColumnarTable
2. Implement projection-aware read_batch(col_indices) in ColumnarTable
3. Add set_required_columns() to VectorizedSeqScanOperator for column projection
4. Propagate required column indices from GROUP BY to scan in build_vectorized_plan

Tests

• All 39 vectorized_operator_tests pass
• All 50 cloudSQL_tests pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b3153300-13d2-477c-826a-ef44259c8e99

📥 Commits

Reviewing files that changed from the base of the PR and between e46a1f6 and 2453262.

📒 Files selected for processing (4)

• include/executor/vectorized_operator.hpp
• include/storage/columnar_table.hpp
• src/executor/query_executor.cpp
• src/storage/columnar_table.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch column-projection-pushdown-v2

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[poyrazK]

It's okay to merge