A data engineer compares a query's static plan with its executed plan: a SortMergeJoin became a BroadcastHashJoin, and the number of shuffle partitions in a later stage dropped from 200 to 12 after the first stage completed. The team debates what caused these changes. Which statement about Adaptive Query Execution (AQE) is correct?
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Correct answer: AQE re-optimizes at runtime using statistics from completed stages, coalescing partitions and converting sort-merge to broadcast joins
Reference: https://docs.databricks.com/aws/en/optimizations/aqe
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Official Answer (C): AQE re-optimizes at runtime using statistics from completed stages, coalescing partitions and converting sort-merge to broadcast joins
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