Optimizing DuckDB Scalar Aggregates: Merging Multiple Scans into One Pass

<h1> Why This Optimization Matters </h1> <p>If you’ve ever run complex analytical queries on large datasets, you know that scanning the same data multiple times can be painfully expensive. In DuckDB, queries with multiple scalar aggregates over the same file or table used to trigger redundant full data scans — one for each aggregate. This inefficiency bloated IO costs and slowed down query executi

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