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4c5a7cda08
The VDBE step() function was taking Arc<MvStore> by value, causing it to be cloned on every single step of query execution. This resulted in thousands of atomic reference count increments/decrements per query, showing up as a major hotspot in profiling. Changed step() and related functions to take Option<&Arc<MvStore>> instead, passing a reference rather than cloning the Arc. This eliminates the unnecessary atomic operations while maintaining the same semantics.