seniorApache Spark
Deep Dive: Adaptive Query Execution (AQE).
Updated May 5, 2026
Short answer
AQE is an optimization technique that re-optimizes query plans during runtime based on actual data statistics.
Deep explanation
Introduced in Spark 3.0, AQE addresses three main issues: 1. Dynamically coalescing shuffle partitions. 2. Switching join strategies (e.g., SortMerge to Broadcast). 3. Dynamically handling skew joins.
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