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Target customers: All customers. New features /specifications: Nested column pruning is a MaxCompute performance optimization for queries on complex types. When a table contains nested types such as STRUCT, ARRAY, MAP, or multi-layer composite nested types, queries typically access only a small subset of fields. When enhanced nested column pruning is enabled, MaxCompute scans only the actually needed subfields when reading data, avoiding unused nested fields. This reduces storage I/O, lowers memory overhead, and improves query performance.