The major challenge of allowing an operation to be pushed down is to ensure that the same query result can be achieved regardless of where the operation is performed.
允许操作下推的主要挑战是确保无论在何处执行操作，取得的查询结果总是相同的。
The major challenge of allowing an operation to be pushed down is to ensure that the same query result can be achieved regardless of where the operation is performed.
允许操作下推的主要挑战是确保无论在何处执行操作，取得的查询结果总是相同的。
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